Asymmetric Synthesis of CDP840 by Jacobsen Epoxidation. An Unusual Syn Selective Reduction of an Epoxide
作者:J. E. Lynch、W.-B. Choi、H. R. O. Churchill、R. P. Volante、R. A. Reamer、R. G. Ball
DOI:10.1021/jo971476c
日期:1997.12.1
An asymmetric synthesis of the PDE IV inhibitor, CDP840 (3) is reported. The absolute stereochemistry was controlled by a Jacobsen epoxidation of the Z triaryl olefin 8 (89% ee) or the E triaryl olefin 9 (48% ee). The disparate results in stereocontrol were interpreted in terms of the "skewed side-on approach model" proposed by Jacobsen. LiBK4 . BH3 reduction of the epoxides was found to proceed with retention of configuration.