Stereoselective ultrasonically induced reductive monosilylation of geminal dibromonorcaranes. Steric effects
作者:Brian C Raimundo、Albert J Fry
DOI:10.1016/s0022-328x(99)00146-1
日期:1999.7
Sonochemical reductive silylation of 1-R-7,7-dibromonorcaranes (R = H, Me, Et, i-Pr) by magnesium produces in each case two 7-bromo-7-trialkylsilylnorcaranes (alkyl = methyl or ethyl). The major isomer is exo (the trialkylsilyl group is cis to the R substituent), but the stereoselectivity of silylation decreases as the alkyl group size at C-l increases, 1-Phenyl-7,7-dibromonorcarane produced a mixture of phenylcycloheptadienes and monobromonorcaranes. (C) 1999 Elsevier Science S.A. All rights reserved.