Organometallic-crown reagents. Anti-Cram selectivity via R2CuLi.cntdot.crown and enhanced Cram selectivity via RLi.cntdot.crown and RMgX.cntdot.crown
作者:Yoshinori Yamamoto、Kazuhiro Maruyama
DOI:10.1021/ja00308a054
日期:1985.10
YAMAMOTO, Y.;MARUYAMA, K., J. AMER. CHEM. SOC., 1985, 107, N 22, 6411-6413
作者:YAMAMOTO, Y.、MARUYAMA, K.
DOI:——
日期:——
Electronic and conformational effects on .pi.-facial stereoselectivity in nucleophilic additions to carbonyl compounds
作者:Yun Dong Wu、K. N. Houk
DOI:10.1021/ja00237a051
日期:1987.2
Influnce des interactions de torsion dans la reduction des cetones par les hydrures interpretation generale du deroulement sterique de la reduction des cetones acycliques et de l'addition des organomagnesiens sur les aldehydes acycliques
作者:M. Cherest、N. Prudent
DOI:10.1016/s0040-4020(01)83128-8
日期:1980.1
Reduction of ketones L-CHMe-CO-R [L=Ph and Cy(Cy = cyclohexyl) and R=Me, Et, iPr and tBu] affords pairs of diastereoisomeric alcohols L-CHMe-CHOH-R. The predominant diastereoisomer is always that predicted by Cram's rule, and the stereoselectivity of the reaction generally increases as R is made more bulky. Thus, with LiAlH4 in ether at 35°, the diastereoisomer ratios are respectively 2.8:1, 3.2:1