Synthesis and Diastereoselective <i>ortho</i>-Lithiation/Cyclopalladation of Enantiopure [2-Imidazolyl]-1‘,2‘,3‘,4‘,5‘-pentamethylferrocenes and -1‘,2‘,3‘,4‘,5‘-pentaphenylferrocenes
作者:René Peters、Zhuo-qun Xin、Daniel F. Fischer、W. Bernd Schweizer
DOI:10.1021/om060187o
日期:2006.6.1
synthetic routes to enantiomericallypure 1‘,2‘,3‘,4‘,5‘-pentamethyl and -pentaphenylferrocenyl imidazolines are described. While the former complexes were diastereoselectively ortho-lithiated and subsequently functionalized by trapping with various electrophiles, the latter complexes could be diastereoselectively cyclopalladated, allowing the preparation of the first enantiomericallypure ferrocenyl palladacycles
描述了对映体纯的1',2',3',4',5'-五甲基和-五苯基二茂铁基咪唑啉的简便合成路线。虽然前者的复合物是非对映选择性地邻位化的,然后通过捕获各种亲电试剂进行官能化,但后者的复合物可以被非对映选择性地环钯化,从而可以制备第一个对映体纯的带有C 5 Me 5或C 5 Ph 5旁观者配体的二茂铁基戊二环。平面手性四环四环化合物已被证明是烯丙基三氟乙酰亚氨酸酯的氮杂-克莱森重排反应的有前途的催化剂。