Alkoxy-directed cyclopropanation of 1,1-disubstituted alkenes with esters: new approach to quaternary carbon centers
摘要:
As a new approach to the stereocontrolled construction of quaternary centers, 1,2,2-trisubstituted cyclopropanols are prepared by the olefin exchange-mediated Kulinkovich cyclopropanation of esters with 1,1-disubstituted alkenes bearing homoallylic alcohols. Central to the successful cyclopropanation is the generation of a temporary alkoxy tether from a homoallylic alcohol. (C) 2014 Elsevier Ltd. All rights reserved.
7-METHYL-3-METHYLENE-7-OCTENYL HALIDE, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PRODUCING 7-METHYL-3-METHYLENE-7-OCTENYL PROPIONATE
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20160185690A1
公开(公告)日:2016-06-30
Provided is a simple, selective and efficient method for producing 7-methyl-3-methylene-7-octenyl propionate and the like. More specifically, provided is, for example, a method for producing 7-methyl-3-methylene-7-octenyl propionate, comprising the steps of: subjecting a nucleophile represented by Formula (1) and an electrophile represented by Formula (2) to a coupling reaction to obtain a 7-methyl-3-methylene-7-octenyl halide represented by Formula (3), and subjecting the 7-methyl-3-methylene-7-octenyl halide (3) to propionyloxylation to obtain the 7-methyl-3-methylene-7-octenyl propionate represented by Formula (4).
7-methyl-3-methylene-7-octenal acetal compound and methods for producing aldehyde compound and ester compound using the same
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US10611718B2
公开(公告)日:2020-04-07
There are provided methods of efficiently producing compounds that are, for example, sex pheromones of San Jose Scale. For example, there is provided a method for producing a 7-methyl-3-methylene-7-octenyl carboxylate compound (4), the method including the steps of: hydrolyzing a 7-methyl-3-methylene-7-octenal acetal compound (1) to obtain 7-methyl-3-methylene-7-octenal (2); reducing the 7-methyl-3-methylene-7-octenal (2) to obtain 7-methyl-3-methylene-7-octenol (3); and esterifying the 7-methyl-3-methylene-7-octenol (3) to obtain a 7-methyl-3-methylene-7-octenyl carboxylate compound (4).