Carbolithiation for the Generation of Cyclooctadienyl Anions and Tandem Electrocyclization/Alkylation to Functionalized <i>cis</i>-Bicyclo[3.3.0]octenes
作者:David R. Williams、Jonathan T. Reeves
DOI:10.1021/ja049353e
日期:2004.3.1
construction of functionalized cis-bicyclo[3.3.0]octenes has been developed. Carbolithiation of 3-methylene-1,4-cyclooctadiene with 1 degrees , 2 degrees , or 3 degrees alkyllithium reagents leads to cyclooctadienyl anions, which undergo disrotatory electrocyclization and subsequent trapping with carbon, oxygen, sulfur, or silicon electrophiles to provide functionalized cis-bicyclo[3.3.0]octenes. Transmetalation
已经开发了用于构建功能化顺式双环[3.3.0]辛烯的强大级联反应过程。3-亚甲基-1,4-环辛二烯与 1 度、2 度或 3 度烷基锂试剂的碳锂化导致环辛二烯基阴离子,其经历旋转电环化并随后被碳、氧、硫或硅亲电试剂捕获以提供功能化的顺式-双环[3.3.0]辛烯。烯丙基锂中间体的金属转移允许获得反应性的铜酸盐歧管。使用这种方法快速构建线性三喹烷证明了合成应用的潜力。