Method for producing 5-hydroxypiperidine-2-carboxylic acid
A method for producing (2S,5S)/(2R,5R)-5-hydroxypiperidine-2-carboxylic acid represented by the formula (10) below: the method comprising the step of removing the protecting group from the hydroxyl group in a compound represented by the formula (7) below: (wherein P represents a protecting group, R 3 represents an alkyl group containing 1 to 4 carbon atoms, and A represents an alkyl group containing 1 to 10 carbon atoms, an aryl group containing 6 to 12 carbon atoms, an alkyloxy group containing 1 to 4 carbon atoms, or an aralkyloxy group containing 7 to 20 carbon atoms) to synthesize a compound represented by the formula (8) below: (wherein R 3 represents an alkyl group containing 1 to 4 carbon atoms, and A represents an alkyl group containing 1 to 10 carbon atoms, an aryl group containing 6 to 12 carbon atoms, an alkyloxy group containing 1 to 4 carbon atoms, or an aralkyloxy group containing 7 to 20 carbon atoms).
1. A method for producing (2S,5S)/(2R,5R)-5-hydroxypiperidine-2-carboxylic acid represented by the formula (10) below:
the method comprising (i) the step of:
(a) hydrolyzing the ester groups of the compound (8) below:
wherein R 3 represents an alkyl group containing 1 to 4 carbon atoms, and A represents an alkyl group containing 1 to 10 carbon atoms, an aryl group containing 6 to 12 carbon atoms, an alkyloxy group containing 1 to 4 carbon atoms, or an aralkyloxy group containing 7 to 20 carbon atoms,
and allowing one of the carboxyl groups to react with the hydroxyl group to allow the lactonization, and further decarboxylating the other carboxyl group; or
(b) hydrolyzing the ester groups of the compound (8), decarboxylating one of the carboxyl groups to form a stereoisomeric mixture of a 2-monocarboxylic acid, and then isomerizing and lactonizing the stereoisomeric mixture;
to synthesize a compound represented by the formula (9) below:
wherein A represents an alkyl group containing 1 to 10 carbon atoms, an aryl group containing 6 to 12 carbon atoms, an alkyloxy group containing 1 to 4 carbon atoms, or an aralkyloxy group containing 7 to 20 carbon atoms.
2. The method for producing (2S,5S)/(2R,5R)-5-hydroxypiperidine-2-carboxylic acid according to claim 1 , further comprising (ii) the step of:
cleaving the amide bond in the compound (9) and hydrolyzing the lactone in the compound (9) to synthesize (2S,5S)/(2R,5R)-5-hydroxypiperidine-2-carboxylic acid.