exo-Adduct predominance in the Diels-Alder reaction of novel 1,3-bis(trimethylsiloxy)cyclohexa-1,3-dienes with acrylonitrile.
作者:TOSHIRO IBUKA、YUJI MORI、TOSHITAKA AOYAMA、YASUO INUBUSHI
DOI:10.1248/cpb.26.456
日期:——
The Diels-Alder reaction of the novel 1, 3-bis (trimethylsiloxy) cyclohexa-1, 3-dienes (3a-3c) with acrylonitrile followed by hydrolysis afforded the exo-2-cyano-1-hydroxybicyclo [2. 2. 2] octanes (4a-4c) and the endo-2-cyano-1-hydroxybicyclo [2. 2. 2] octanes (5a-5c) as the major and the minor adducts, respectively. The configuration of the cyano group of the adducts were inferred from the nuclear magnetic resonance spectral inspections of the appropriate derivatives obtained from the adducts and these assignments of the adducts (4a, 4b, 5a, and 5b) were supported by chemical evidence.
新型 1,3-双(三甲基硅氧基)环己-1,3-二烯(3a-3c)与丙烯腈发生 Diels-Alder 反应,然后水解,得到外型-2-氰基-1-羟基双环[2. 2. 2]辛烷(4a-4c)和内型-2-氰基-1-羟基双环[2. 2. 2]辛烷(5a-5c),分别作为主要和次要加合物。加合物中氰基的构型是通过对从加合物中得到的相应衍生物的核磁共振光谱检测推断出来的,加合物(4a、4b、5a 和 5b)的这些构型得到了化学证据的支持。