Thermal intramolecular cycloaddition of 4-alkenylfulvene; highly regio- and diastereoselective formation of [4+2] adduct
作者:Hiroyoshi Kitano、Shinya Fujita、Yutaka Takehara、Masakazu Hattori、Toshio Morita、Kazutsugu Matsumoto、Minoru Hatanaka
DOI:10.1016/s0040-4020(03)00297-7
日期:2003.4
4-Alkenylfulvenes were prepared by the annulation of 1,4-ynediones and allylidenetriphenylphosphorane and subjected to a thermal reaction. Highly regio- and stereoselective [4+2] cycloaddition is accomplished with 4-((R)-3-benzyloxypent-4-en-1-yl)fulvene and the resulting adduct is transformed into bicyclo[3.3.0]octene derivative.
通过将1,4-乙二酮和烯丙基二苯并苯基膦环化,制备4-烯基富烯烯,并进行热反应。高度区域和立体选择性的[4 + 2]环加成反应是通过4-((R)-3-苄氧基戊-4-烯-1-基)富烯完成的,所得的加合物转化为双环[3.3.0]辛烯衍生物。