Oxime conjugates and methods for their formation and use
The present invention relates to biodegradable biocompatible polyketals, methods for their preparation, and methods for treating animals by administration of biodegradable biocompatible polyketals. In one aspect, a method for forming the biodegradable biocompatible polyketals comprises combining a glycol-specific oxidizing agent with a polysaccharide to form an aldehyde intermediate, which is combined with a reducing agent to form the biodegradable biocompatible polyketal. The resultant biodegradable biocompatible polyketals can be chemically modified to incorporate additional hydrophilic moieties. A method for treating animals includes the administration of the biodegradable biocompatible polyketal in which biologically active compounds or diagnostic labels can be disposed. The present invention also relates to chiral polyketals, methods for their preparation, and methods for use in chromatographic applications, specifically in chiral separations. A method for forming the chiral polyketals comprises combining a glycol-specific oxidizing agent with a polysaccharide to form an aldehyde intermediate, which is combined with a suitable reagent to form the chiral polyketal. A method for use in chiral separations includes the incorporation of the chiral polyketals in the mobile phase during a chromatographic separation, or into chiral stationary phases such as gels. The present invention further relates to chiral polyketals as a source for chiral compounds, and methods for generating such chiral compounds.
1. A compound of formula: R N1 R N2 N—O-L 1 ; wherein
R N1 and R N2 are independently hydrogen, an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aryl or heteroaryl moiety, or a nitrogen protecting group such that the nitrogen atom taken together with the protecting group forms a moiety selected from the group consisting of a carbamate, an amide, a cyclic imide, a N-alkyl amine, and N-aryl amines, an imine, and an enamine, or R N1 and R N2 , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic or heteroaryl moiety; and
L 1 is a moiety of formula: —(CR L1 R L2 ) p -Q, wherein p is an integer from 0-6, R L1 and R L2 are independently hydrogen, an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aryl or heteroaryl moiety or WR W1 wherein W is O, S, NH, CO, SO 2 , COO, CONH, and R W1 is hydrogen, an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aryl, heteroaryl, alkylaryl or alkylheteroaryl moiety, and Q is
2. The compound of claim 1 , wherein L 1 is —(CH 2 ) p Q wherein p is an integer from 0-5, and Q is
3. A compound of formula: R N1 R N2 N—O-L 1 ; wherein:
R N1 and R N2 are independently hydrogen or a nitrogen protecting group such that the nitrogen atom taken together with the protecting group forms a moiety selected from the group consisting of a carbamate, an amide, a cyclic imide, a N-alkyl amine, and N-aryl amines, an imine, and an enamine,
L 1 is —(CH 2 ) p1 —CH(OH)CH 2 NHQ or —(CR L1 R L2 ) p -Q,
R L1 and R L2 are independently hydrogen, an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aryl or heteroaryl moiety or WR W1 wherein W is O, S, NH, CO, SO 2 , COO, CONH, and R W1 is hydrogen, an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aryl, heteroaryl, alkylaryl or alkylheteroaryl moiety,
p is an integer from 1-6,
p 1 is an integer from 1-5, and
Q is a maleimidyl moiety adapted for covalent binding to a modifier.
4. The compound of claim 1 , wherein R N1 R N2 N— is a moiety of formula:
5. The compound of claim 3 , wherein Q is a maleimidyl moiety of structure:
wherein p 2 is an integer from 1-5.
6. The compound of claim 2 , 3 , or 5 , wherein R N1 R N2 N— is a moiety of structure:
7. The compound of claim 5 , of formula: