Disaccharides for drug discovery
Methods are described for the preparation of combinatorial libraries of potentially biologically active disaccharide compounds. These compounds are variously functionalized, with a view to varying lipid solubility size, function an other properties, with the particular aim of discovering novel drug or drug-like compounds, or compounds with useful properties. The invention provides intermediates, processes and synthetic strategies for the solution or solid phase synthesis of disaccharides, variously functionalized about the sugar ring, including the addition of aromaticity and charge, and the placement of pharmaceutically useful groups and isosteres.
1. A disaccharide compound of formula (1)
A-d-L-e-B Formula (1)
wherein A is represented by the formula
and B is represented by the formula
Y is selected from the group consisting of hydrogen or the following:
wherein:
Z is selected from hydrogen or X1,
Q is selected from hydrogen or W,
W is a moiety of 1 to 20 non-hydrogen atoms and is selected from the group consisting of alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, arylalkyl and heteroarylalkyl,
X1 is a moiety of 1 to 20 non-hydrogen atoms and is selected from the group consisting of alkyl, alkenyl, alkynyl, heteroalkyl, acyl, arylacyl, heteroarylacyl, aryl, heteroaryl, arylalkyl and heteroarylalkyl,
the groups R2, R3, R4, R5, R3′, R4′ and R5′ are independently selected from the group consisting of hydrogen, N 3 , OH, OX4, and N(Z)Y, wherein N(Z)Y is as defined above or Y is
where Q and W are as defined above, such that at least one of R3′, R4′ and R5′ is OX4 or N(Z)Y, at least one of R2, R3, R4 and R5 is OX4 or N(Z)Y, at least one of R3′, R4′ and R5′ is OH, and at least one of R2, R3, R4 and R5 is OH;
X4 is a moiety of 1 to 20 non-hydrogen atoms and is independently selected from the group consisting of alkyl, alkenyl, alkynyl, heteroalkyl, aminoalkyl, aminoaryl, aryloxy, alkoxy, heteroaryloxy, aminoaryl, aminoheteroaryl, alkylcarbamoyl, arylcarbamoyl heteroarylcarbamoyl, aryl, heteroaryl, arylalkyl and heteroarylalkyl; and
d and e represent the connection points for A and B wherein e replaces one of the groups R3′, R4′, or R5′ in group B and the group d-L-e represents —O—;
and with the provisos that:
a) any of the groups R2 to R5 on ring A may not combine together to form a cycle, and any of the groups R3′ to R5′ on ring B may not combine to form a cycle,
b) X4 may not be another carbohydrate ring, a cyclitol ring or contain another carbohydrate ring, and
c) all of the X4 substituents may not be the same.
2. The compound of claim 1 , wherein X1 is substituted with at least one moiety selected from the group consisting of OH, NO, NO 2 , NH 2 , N 3 , halogen, CF 3 , CHF 2 , CH 2 F, nitrile, alkoxy, aryloxy, amidine, guanidiniums, carboxylic acid, carboxylic acid ester, carboxylic acid amide, aryl, cycloalkyl, heteroalkyl, heteroaryl, aminoalkyl, aminodialkyl, aminotrialkyl, aminoacyl, substituted or unsubstituted imine, sulfate, sulfonamide, phosphate, phosphoramide, hydrazide, hydroxamate, and hydroxamic acid.
3. The compound of claim 1 , wherein Z and Y of an N(Z)Y group are combined to form a ring structure of 4 to 10 non-hydrogen atoms.
4. The compound of claim 3 , wherein the ring structure is substituted with X1 groups.
5. The compound of claim 1 , wherein the structure of formula (1) is
6. The compound of claim 1 , wherein the structure of formula (1) is
7. The compound of claim 1 , wherein the structure of formula (1) is