Optically active compounds, method for kinetic optical resolution of carboxylic acid derivatives and catalysts therefor
View Patent ↗The present invention provides a method of kinetic optical resolution of carboxylic acid derivatives using specific optically active catalysts. A racemic or diastereomeric mixture of carboxylic acid derivatives of the formula (A) is reacted with a nucleophile in the presence of an optically active catalyst to form an optically active nucleophile derivative of the formula (B). The catalyst is an optically active compound represented by the formula (C) or (D) [wherein R 1 is a substituted or unsubstituted, saturated or unsaturated, straight-chain, branched or alicyclic aliphatic hydrocarbon group which can have a heteroatom, R 2 is ethyl or vinyl, and R 5 is hydrogen or methoxy respectively].
1. An optically active compound represented by the following general formula (C) or (D),
wherein R 1 is a group having one to 20 carbon atoms and represented by the following general formula (G), (H), or (J),
wherein R 4 , R 6 , R 7 , R 8 and R 9 , the same or different, are a hydrogen atom or a substituted or unsubstituted, saturated or unsaturated, straight-chain, branched or alicyclic aliphatic hydrocarbon group which can have an oxygen atom, or a substituted or unsubstituted aromatic hydrocarbon group, R 2 is ethyl or vinyl, and R 5 is a hydrogen atom or methoxy.
2. An optically active compound represented by the following general formula (C) or (D),
wherein R 1 is allyl, propynyl, tert-butoxycarbonylmethyl, 2-methoxyethyl, 2-butynyl, iso-propoxycarbonylmethyl, methoxycarbonylniethyl, o-methoxybenzyl, m-methoxybenzyl, p-methoxybenzyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 2-furylmethyl, 3-furylmethyl, 2-thienylmethyl, 3-thienylmethyl, 1-naphthylmethyl, 2-naphthylmethyl, prenyl, cinnamyl, methallyl, homoallyl, homobenzyl, N,N-diethylaminocarbonylmethyl, cyanomethyl, acetylmethyl, cyclopropylmethyl, 3-phenyl-2-propynyl, 3-methoxycarbonyl-2-propynyl or 3-methoxycarbonyl-2-propenyl, R 2 is ethyl or vinyl, and R 5 is a hydrogen atom or methoxy.
3. An optically active compound according to claim 1 , wherein R 4 , R 6 , R 7 , R 8 , and R 9 , the same or different, are a hydrogen atom or a saturated or unsaturated hydrocarbon group which can have an oxygen atom, or an aromatic hydrocarbon group.