Regio- and diastereo-selectivity of the insertion of aldehydes into alkyne zirconocene complexes
作者:Martin E. Maier、Thorsten Oost
DOI:10.1016/0022-328x(95)05587-2
日期:1995.12
aldehydes into alkyne-zirconocene complexes provides configurationally pureallyl alcohols in a one-pot procedure. In the case of unsymmetrical alkynes, the regioselectivity of the insertion process is high for terminal alkynes. With trimethylsilyl-substituted alkynes the regioseectivity is low. The insertion of chiral aldehydes into the symmetrical oct-4-yne-zirconocene complex provides the Cram isomer as
将醛插入炔烃-锆茂复合物中可通过一锅法提供构型纯烯丙基醇。在不对称炔烃的情况下,对于末端炔烃,插入过程的区域选择性较高。用三甲基甲硅烷基取代的炔烃,其区域选择性低。手性醛插入对称的oct-4-yne-zirconocene配合物中可提供Cram异构体作为主要产物。另一方面,衍生自末端炔烃的配合物与2-苯基丙醛的反应主要导致抗-Cram产物。用四中心过渡状态模型解释了结果。