Preparation of 3-Cycloheptenyl and 3-Cyclooctenyl Derivatives by Solvolysis of Bicyclo[n.2.0]alkyl Esters
作者:Chrong-Shiong Hwang、William Reusch
DOI:10.1055/s-1989-27274
日期:——
Ester derivatives of 6-substituted cis-bicyclo[3.2.0]heptan-6-ol, and of 7-substituted cis-bicyclo[4.2.0]octan-7-ol were solvolyzed to the corresponding cycloheptene and cyclooctene products. In general, acetolysis of the 3,5-dinitrobenzoates in glacial or aqueous acetic acid proved most effective for this transformation. The conjugated dienes obtained from geminal alkenylhydroxy starting materials were sensitive to polymerization and/or olefin isomerization, but were sufficiently stable to permit spectroscopic characterization and subsequent reaction with dienophiles.
6-取代的顺式双环[3.2.0]庚烯-6-醇和7-取代的顺式双环[4.2.0]辛烯-7-醇的酯衍生物被溶剂解离生成相应的环戊烯和环辛烯产物。一般来说,在冰醋酸或水性醋酸中对3,5-二硝基苯甲酸酯的乙酰解证明对这一转化最有效。从双键醇起始材料得到的共轭二烯对聚合和/或烯烃异构化敏感,但足够稳定以便进行光谱表征和随后与二烯亲电试剂的反应。