Chirality sensing with molecular click chemistry probes
The present invention relates to an analytical method that includes providing a sample potentially containing a chiral analyte that can exist in stereoisomeric forms, and providing a probe selected from the group consisting of coumarin-derived Michael acceptors, dinitrofluoroarenes and analogs thereof, arylsulfonyl chlorides and analogs thereof, arylchlorophosphines and analogs thereof, aryl halophosphites, and halodiazaphosphites. The sample is contacted with the probe under conditions to permit covalent binding of the probe to the analyte, if present in the sample; and, based on any binding that occurs, the absolute configuration of the analyte in the sample, and/or the concentration of the analyte in the sample, and/or the enantiomeric composition of the analyte in the sample is/are determined. The probe may be a coumarin-derived Michael acceptor, a di nitrofluoroarene or analog thereof, an arylsulfonyl chloride or analog thereof, an arylchlorophosphine or analog thereof, an aryl halophosphite, or a halodiazaphosphite.
1 . An analytical method comprising:
providing a sample containing a chiral analyte that can exist in stereoisomeric forms;
providing an achiral probe selected from the group consisting of coumarin-derived Michael acceptors, dinitrofluoroarenes and analogs thereof, arylsulfonyl chlorides and analogs thereof, arylchlorophosphines and analogs thereof, aryl halophosphites, and halodiazaphosphites;
contacting the sample with the probe under conditions to permit covalent binding of the probe to the analyte; and
performing a first spectroscopic analysis using one of circular dichroism (CD), optical rotatory dispersion and polarimetry, and/or a second spectroscopic analysis using one of ultraviolet (UV) spectroscopy and fluorescence spectroscopy to obtain, based on any covalent binding that occurs during said contacting, one or more of an absolute configuration of the analyte in the sample, concentration of the analyte in the sample, and an enantiomeric composition of the analyte in the sample.
2 . The analytical method of claim 1 , wherein the probe is a coumarin-derived Michael acceptor of Formula I:
wherein:
Y is hydrogen or an electron withdrawing group selected from the group consisting of —CF 3 , —C(O)R a , —SO 2 R a , —CN, and —NO 2 ; wherein each R a is independently selected from the group consisting of —H, -alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, -aryl, —O-aryl, —N-aryl, -heteroaryl, —O-heteroaryl, —N-heteroaryl, -cycloalkyl, —O-cycloalkyl, —N-cycloalkyl, -heterocycloalkyl, —O-heterocycloalkyl, and —N-heterocycloalkyl; and
X is a leaving group selected from a halogen, —OR b , —OC(O)R b , —OS(O) 2 R b , —S(O) 2 —O—R b , —N 2 + , —N + (R b ) 3 , —S + (R b ) 2 , and —P + (R b ) 3 ; wherein each R b is independently selected from the group consisting of -alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, perfluoroalkyl, -perfluoroalkenyl, -perfluoroalkynyl, -aryl, perfluoroaryl, —O-aryl, —N-aryl, —O-perfluoroaryl, —N-perfluoroaryl, -heteroaryl, —O-heteroaryl, —N-heteroaryl, -cycloalkyl, —O-cycloalkyl, —N-cycloalkyl, -heterocycloalkyl, —O-heterocycloalkyl, and —N-heterocycloalkyl.
3 . The analytical method of claim 2 , wherein the probe is a coumarin-derived Michael acceptor selected from the group consisting of:
4 . The analytical method of claim 2 , wherein the probe is a coumarin-derived Michael acceptor and the analyte is an amino acid or an amino alcohol, or comprises one or more functional groups selected from the group consisting of amines, carboxylic acids, hydroxy acids, and thiols.
5 . The analytical method of claim 1 , wherein the probe is a dinitrofluoroarene or analog thereof of Formula II:
wherein:
each Y is independently selected from the group consisting of —NO 2 , —CN, —C(O)R a , and —SO 2 R a , wherein each R a is independently selected from the group consisting of —H, -alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, -perfluoroalkyl, -aryl, -perfluoroaryl, —O-aryl, —N-aryl, -heteroaryl, —O-heteroaryl, —N-heteroaryl, -cycloalkyl, —O-cycloalkyl, —N-cycloalkyl, -heterocycloalkyl, —O-heterocycloalkyl, and —N-heterocycloalkyl;
X is a leaving group selected from halogen, —OR b , —OC(O)R b , —OS(O) 2 R b , —S(O) 2 —O—R b , —N 2 + , —N + (R b ) 3 , —S + (R b ) 2 , and —P + (R b ) 3 ; wherein each R b is independently selected from the group consisting of -alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, -perfluoroalkyl, -perfluoroalkenyl, -perfluoroalkynyl, -aryl, -perfluoroaryl, —O-aryl, —N-aryl, -heteroaryl, —O-heteroaryl, —N-heteroaryl, -cycloalkyl, —O-cycloalkyl, —N-cycloalkyl, -heterocycloalkyl, —O-heterocycloalkyl, and —N-heterocycloalkyl; and
R 1 is selected from the group consisting of —NH 2 , —NHC(O)CH 2 Ar, —NHC(O)Ar, -hydrogen, -alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, -aryl, —O-aryl, —N-aryl, -heteroaryl, —O-heteroaryl, —N-heteroaryl, -cycloalkyl, —O-cycloalkyl, —N-cycloalkyl, -heterocycloalkyl, —O-heterocycloalkyl, —N-heterocycloalkyl, —CN, —C(O)R c , —CO 2 R c , —SO 2 R c , —C(O)NHR c , —S-alkyl, —S-aryl, and —S-heteroaryl;
wherein:
each R c is independently -Ar, -alkyl, or —CH 2 Ar; and
each Ar is independently an aryl, heteroaryl, cycloalkyl, heterocycloalkyl, perfluoroalkyl, or perfluoroaryl.
6 . The analytical method of claim 5 , wherein the probe is a dinitroflourarene selected from:
7 . The analytical method of claim 1 , wherein the probe is an arylsulfonyl chloride or analog thereof of Formula III:
wherein:
X is selected from the group consisting of -halogen, —O-aryl, —O-heteroaryl, —O-cycloalkyl, —O-heterocycloalkyl, —O-alkyl, —O-perfluoroalkyl, —O-perfluoroaryl, —N-aryl, —N-heteroaryl, —N-cycloalkyl, —N-heterocycloalkyl, —N-alkyl, —N-perfluoroalkyl, —N-perfluoroaryl, —N(Ar)SO 2 Ar, —NHSO 2 Ar, and —NHAr; and
R 2 is an aryl or heteroaryl, wherein the aryl or heteroaryl is optionally substituted with one or more groups selected from-alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, —O-aryl, —O-heteroaryl, —N-aryl, —N-heteroaryl, -aryl, —C(O)R c , —CO 2 R c , —O—C(O)R c , —NHC(O)R c , —NR c C(O)R c , —NO 2 , —CN, -halogen, and —SO 2 R c , wherein each R c is independently Ar, alkyl, or CH 2 Ar;
wherein each Ar is independently an aryl or heteroaryl.
8 . The analytical method of claim 7 , wherein the probe is the arylsulfonyl chloride:
9 . The analytical method of claim 1 , wherein the probe is an arylchlorophosphine or analog thereof of Formula IV:
wherein:
X is selected from the group consisting of -halogen, —O-aryl, —O-heteroaryl, —O-cycloalkyl, —O-heterocycloalkyl, —O-alkyl, —O-perfluoroalkyl, and —O-perfluoroaryl; and
each R 2 is independently an aryl or heteroaryl, wherein the aryl or heteroaryl is optionally substituted with one or more groups selected from-alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, —O-aryl, —O-heteroaryl, —N-aryl, —N-heteroaryl, -aryl, —C(O)R c , —CO 2 R c , —O—C(O)R c , —NHC(O)R c , —NR c C(O)R c , —NO 2 , —CN, -halogen, and —SO 2 R c , wherein each R c is independently Ar, alkyl, or CH 2 Ar and Ar is an aryl or heteroaryl.
10 . The analytical method of claim 9 , wherein the probe is the arylchlorophosphine:
11 . The analytical method of claim 1 , wherein the probe is an aryl halophosphite of Formula V:
wherein:
X is a halogen; and
(i) R 3 and R 4 are each independently an aryl or heteroaryl, wherein the aryl or heteroaryl is optionally substituted with one or more groups selected from-alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, —O-aryl, —O-perfluoroaryl, —O-heteroaryl, —N-aryl, —N-heteroaryl, -aryl, —C(O)R c , —CO 2 R c , —O—C(O)R c , —NHC(O)R c , —NR c C(O)R c , —NO 2 , —CN, -halogen, and —SO 2 R c , wherein each R c is independently Ar, alkyl, or CH 2 Ar and Ar is an aryl or heteroaryl; and
Z is selected from the group consisting of a bond, —C(O)—, —O—, —NR d —, —S—, and —CH 2 —, wherein R a is H, alkyl, aryl, or heteroaryl; or
(ii) R 3 and R 4 , together with the carbon atoms to which they are attached, form a monocyclic or bicyclic ring system selected from the group consisting of cycloalkyl, heterocycloalkyl, aryl, and heteroaryl, wherein the ring system is optionally substituted with one or more groups selected from-alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, —O-aryl, —O-heteroaryl, —N-aryl, —N-heteroaryl, -aryl, —C(O)R c , —CO 2 R c , —O—C(O)R c , —NHC(O)R c , —NR c C(O)R c , —NO 2 , —CN, -halogen, and —SO 2 R c , wherein each Re is independently Ar, alkyl, or CH 2 Ar and Ar is an aryl or heteroaryl; and
Z is absent.
12 . The analytical method of claim 11 , wherein the probe is an aryl chlorophosphite selected from the group consisting of:
13 . The analytical method of claim 1 , wherein the probe is a halodiazaphosphite of Formula VI:
wherein:
X is a halogen;
R 3 and R 4 are each independently -aryl or -heteroaryl, wherein the aryl or heteroaryl is optionally substituted with one or more groups selected from-alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, —O-aryl, —O-heteroaryl, —N-aryl, —N-heteroaryl, -aryl, —C(O)R c , —CO 2 R c , —O—C(O)R c , —NHC(O)R c , —NR c C(O)R c , —NO 2 , —CN, -halogen, and —SO 2 R c , wherein each R c is independently Ar, alkyl, or CH 2 Ar and Ar is an aryl or heteroaryl; or R 3 and R 4 , together with the carbon atoms to which they are attached, form a monocyclic or bicyclic ring system selected from the group consisting of cycloalkyl, heterocycloalkyl, aryl, and heteroaryl, wherein the ring system is optionally substituted with one or more groups selected from-alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, —O-aryl, —O-heteroaryl, —N-aryl, —N-heteroaryl, -aryl, —C(O)R c , —CO 2 R c , —O—C(O)R c , —NHC(O)R c , —NR c C(O)R c , —NO 2 , —CN, -halogen, and —SO 2 R c , wherein each R c is independently Ar, alkyl, or CH 2 Ar and Ar is an aryl or heteroaryl; and
each R 5 is independently selected from-alkyl, -aryl, —CH 2 -aryl, —CH 2 -heteroaryl, -cycloalkyl, -heterocycloalkyl, and -heteroaryl, wherein the alkyl, aryl, CH 2 -aryl, CH 2 -heteroaryl, cycloalkyl, heterocycloalkyl, or heteroaryl is optionally substituted with one or more groups selected from-alkyl, —O-alkyl, —N-alkyl, -alkenyl, -alkynyl, —O-aryl, —O-heteroaryl, —N-aryl, —N-heteroaryl, -aryl, —C(O)R c , —CO 2 R c , —O—C(O)R c , —NHC(O)R c , —NR c C(O)R c , —NO 2 , —CN, -halogen, and —SO 2 R c , wherein each R c is independently Ar, alkyl, or CH 2 Ar and Ar is an aryl or heteroaryl.
14 . The analytical method of claim 13 , wherein the probe is the chlorodiazaphosphite:
15 . The analytical method of claim 1 , wherein the analyte is an amino acid or an amino alcohol, or comprises one or more functional groups selected from the group consisting of primary amines, secondary amines, alcohols, carboxylic acids, hydroxy acids, thiols, and amides.
16 . The analytical method of claim 1 , wherein the analyte is an amino acid comprising a functionalized side chain or an unprotected amino acid.
17 . The analytical method of claim 1 , wherein said contacting is carried out in one or more solvents selected from aqueous solvents, protic solvents, and aprotic solvents.
18 . The analytical method of claim 1 , wherein said contacting is carried out in air.
19 . The analytical method of claim 1 , wherein said contacting is carried out for about 1 to about 300 minutes.
20 . The analytical method of claim 1 , wherein said contacting is carried out at a temperature range of 23±3° C. and a relative humidity range of 38±5%.
21 . The analytical method of claim 1 , wherein said contacting is carried out at a temperature that is below about 25° C. or between about 50° C. to about 100° C.
22 . The analytical method of claim 1 , wherein the probe is a dinitrofluoroarene or analog thereof, an arylsulfonyl chloride or analog thereof, an arylchlorophosphine or analog thereof, an aryl halophosphite, or a halodiazaphosphite, and the analyte is selected from the group consisting of alcohols, amino acids, amino alcohols, amines, carboxylic acids, hydroxy acids, thiols, amides, and combinations thereof.
23 . The analytical method of claim 1 , wherein two or three of (i)-(iii) are obtained:
(i) the absolute configuration of the analyte in the sample;
(ii) the concentration of the analyte in the sample; and
iii) the enantiomeric composition of the analyte in the sample.
24 . The analytical method of claim 23 , wherein all of (i)-(iii) are obtained.
25 . The analytical method of claim 1 , wherein performing the first spectroscopic analysis is carried out using circular dichroism (CD), and performing the second spectroscopic analysis is carried out using ultraviolet (UV) spectroscopy.