Transition metal-catalyzed asymmetric vinylcyclopropane-cyclopentene rearrangements. Asymmetric synthesis of cyclopentane derivatives using chiral sulfoxides as chiral sources
作者:Kunio Hiroi、Yoshihisa Arinaga
DOI:10.1016/0040-4039(94)88188-x
日期:1994.1
Optically active α-olefinic cyclopropane derivatives, prepared by Michael addition of sodium bromomalonate to chiral vinylic sulfoxides followed by intramolecular asymmetric alkylation, led to facile transformation into chiral cyclopentane derivatives upon treatment with transition metals such as palladium, nickel, and platinum. The stereospecificity of the rearrangements was dependent on the catalysts
光学活性的α-烯烃环丙烷衍生物,是通过将溴化丙二酸酯的迈克尔加成到手性乙烯基亚砜中,然后进行分子内不对称烷基化而制备的,在用过渡金属(例如钯,镍和铂)处理后,它们容易转化为手性环戊烷衍生物。重排的立体特异性取决于所用的催化剂和反应条件。钯催化剂具有最高的立体定向性。