Highly diastereoselective desymmetrizing intramolecular cyclization of allylstannane with a diketone promoted by Lewis acid or transition metal complex
作者:Takashi Shimada、Naoki Asao、Yoshinori Yamamoto
DOI:10.1016/s0022-328x(00)00897-4
日期:2001.4
The Lewis acid mediated desymmetrizing intramolecular cyclization of prochiral allylstannyl diketone (1) gave a mixture of two diastereomers (2 and 3). Highly diastereoselective synthesis of each of the diastereomers was accomplished by appropriate choice of the Lewis acid. Compound 3 was also produced stereoselectively by using a palladium catalyst instead of Lewis acid.
路易斯酸介导的前手性烯丙基锡烷基二酮的分子内非对称化(1)给出了两种非对映异构体(2和3)的混合物。每个非对映体的高度非对映合成通过路易斯酸的合适的选择来完成的。还通过使用钯催化剂代替路易斯酸来立体选择性地生产化合物3。