Asymmetric synthesis of (diene)Fe(CO)3 complexes by a catalytic enantioselective alkylation using dialkylzincs
作者:Yoshiji Takemoto、Yasutaka Baba、Asami Honda、Syusuke Nakao、Izumi Noguchi、Chuzo Iwata、Tetsuaki Tanaka、Toshiro Ibuka
DOI:10.1016/s0040-4020(98)01010-2
日期:1998.12
The reaction of meso-(2, 4-hexadien-1, 6-dial)Fe(CO)3 complex1 with several alkylzincs in the presence of 50 mol% of(S)-(+)-diphenyl(1-methylpyrrolidin-2-yl)methanol6a proceeded with high enantiotopic group- and diastereotopic face-selectivity to give(2R, 6S)-alcohol complexes2a-c as major products, except in the case with dimethylzinc (>90% de and >98% ee). On the other hand, the methylation of1 with
在50摩尔%(S)-(+)-二苯基(1-甲基吡咯烷酮-)的存在下,内消旋-(2,4-hexadien-1,6-dial)Fe(CO)3络合物1与几种烷基锌的反应2-基)甲醇6a以高对映异构基团和非对映异构基团的面孔选择性进行合成,得到(2R,6S)-醇配合物2a-c作为主要产物,二甲基锌(de> 90%和ee> 98% )。另一方面,通过添加1.8当量,用Me 2 Zn进行的1的甲基化以高对映选择性进行。3%(摩尔比)的(S,S)-1,2-双(三氟甲基磺酰胺)环己烷9a的存在下,Ti(Oi-Pr)4的合成(de为82%,ee为96%)。对映选择性烷基化还应用于消旋(山梨醛)Fe(CO)3配合物10的动力学拆分。图选项