A Novel, Highly Enantioselective Ketone Alkynylation Reaction Mediated by Chiral Zinc Aminoalkoxides
作者:Lushi Tan、Cheng-yi Chen、Richard D. Tillyer、Edward J. J. Grabowski、Paul J. Reider
DOI:10.1002/(sici)1521-3773(19990301)38:5<711::aid-anie711>3.0.co;2-w
日期:1999.3.1
Kilogram-scale synthesis of the HIV reverse transcriptase inhibitor efavirenz was achieved by means of a highly enantioselective alkynylation of prochiral ketones 1 with alkynyllithium or alkynylmagnesium reagents in the presence of chiral zinc aminoalkoxides as mediators. With the achiral auxiliary 2,2,2-trifluoroethanol (R3 =CF3 CH2 ), the efavirenz precursor 2 (R1 =H, R2 =cyclopropyl) was obtained
在手性锌氨基醇盐作为介质的情况下,通过手性酮1与炔基锂或炔基镁试剂的高度对映选择性炔基化,可以实现HIV逆转录酶抑制剂依法韦仑的公斤级合成。用非手性辅助2,2,2-三氟乙醇(R 3 = CF 3 CH 2),得到依非韦伦前体2(R 1 = H,R 2 =环丙基),ee为99.2%。