BINOL-Al catalyzed kinetic resolution of citronellal analogues: synthesis of a variety of fragrances
摘要:
A chiral aluminum catalyst was used for the kinetic resolution of citronellal analogues. Racemic 3-alkyl-citronellals gave optically active 5-alkylisopulegols with high enantioselectivity. Unreacted 3-alkyl-citronellal analogues were obtained with low enantioselectivity. The two main diastereoisomers of the product were opposite to each other. The scents of 5-substituted isopulegols were evaluated. The chiral recognition of the catalysts and their effects on the kinetic resolutions are also discussed. (C) 2016 Elsevier Ltd. All rights reserved.
Organomanganese (II) reagents XVIII: Copper-catalyzed 1,4- addition of organomanganese chloride compounds to conjugated ethylenic aldehydes
作者:Gérard Cahiez、Mouad Alami
DOI:10.1016/s0040-4039(00)70698-8
日期:1989.1
Organomanganese chlorides react with β-mono or β,β-bisubstituted α,β-ethylenic aldehydes in the presence of a catalytic amount of copper chloride to give good yields of 1,4-addition products in THF at −30°C.
Correction for ‘Highly selective aluminium-catalysed intramolecular Prins reaction for L-mentholsynthesis’ by H. Itoh et al., RSC Adv., 2014, 4, 61619–61623.
H. Itoh等人对“用于L-薄荷醇合成的高选择性铝催化的分子内Prins反应”的校正。,RSC Adv。,2014,4,61619-61623。
NOVEL LACTONE COMPOUND AND NOVEL ETHER COMPOUND
申请人:TAKASAGO INTERNATIONAL CORPORATION
公开号:US20210047283A1
公开(公告)日:2021-02-18
A lactone compound is represented by general formula (A), and an ether compound is represented by general formula (B). In formula (A), R is a hydrogen atom or R1. When R is a hydrogen atom, R′ is R1, the carbon bond (1) is a single bond or a double bond, and the carbon bond (2) is a single bond. When R is R1, R′ is a hydrogen atom or R1, both the carbon bonds (1) and (2) are a single bond, or one of them is a double bond and the other is a single bond. In formula (B), R″ is R1. R1 represents a specific alkyl group, a specific alkenyl group, a specific alkynyl group, or an aryl group. In formulas (A) and (B), n is 0 or 1.
A chiral aluminum catalyst was used for the kinetic resolution of citronellal analogues. Racemic 3-alkyl-citronellals gave optically active 5-alkylisopulegols with high enantioselectivity. Unreacted 3-alkyl-citronellal analogues were obtained with low enantioselectivity. The two main diastereoisomers of the product were opposite to each other. The scents of 5-substituted isopulegols were evaluated. The chiral recognition of the catalysts and their effects on the kinetic resolutions are also discussed. (C) 2016 Elsevier Ltd. All rights reserved.