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.
Oxidative Transformation of <i>tert</i>-Cyclobutanols by Palladium Catalysis under Oxygen Atmosphere
作者:Takahiro Nishimura、Kouichi Ohe、Sakae Uemura
DOI:10.1021/jo0016475
日期:2001.2.1
Palladium(II)-catalyzed oxidative reaction of tert-cyclobutanols involving the cleavage of a C-C bond via beta-carbon elimination under atmospheric pressure of oxygen is described. An alkylpalladium intermediate produced by beta-carbon elimination from a Pd(II) alcoholate gives a variety of products, depending on the substituents on the cyclobutane ring, in which reactions such as dehydrogenative ring