Studies on palladium-catalyzed enantioselective cyclization of 3,4-allenylic hydrazines with organic halides
作者:Wei Shu、Qing Yang、Guochen Jia、Shengming Ma
DOI:10.1016/j.tet.2008.09.049
日期:2008.12
pyrazolidine derivatives from Pd(0)/(R,R)-Bn-BOX-catalyzed enantioselective cyclization of 3,4-allenylic hydrazines in the presence of organic halides has been developed, the ee value is 75–84%. The absolute configuration of the products was determined by the conversion of one of the products to a known product prepared in this group. The reaction may proceed via the oxidative addition, intermolecular carbometallation
Synthesis of a new spiro-BOX ligand and its application in enantioselective allylic cyclization based on carbopalladation of allenyl hydrazines
作者:Wei Shu、Shengming Ma
DOI:10.1039/b912108k
日期:——
In this paper, we developed a new bisoxazoline ligand with a spiro skeleton and a alpha-naphthylmethyl substituent, i.e. (Ra,S,S)-L3, which has been successfully applied to the highlyenantioselective cyclic allylation based on the carbopalladation of 3,4-allenyl hydrazines with ee values ranging from 92-95%.