Regioselective enzymatic acylation of vicinal diols of steroids
作者:M. Manuel Cruz Silva、Sergio Riva、M. Luisa Sá e Melo
DOI:10.1016/j.tet.2005.01.104
日期:2005.3
Monoacylated derivatives of a complete set of 2,3- and 3,4-vicinal diols of steroids were prepared by regioselectivelipase-catalysed transesterification reactions. The enzymes displayed different selectivities towards the vicinal diols depending on the configuration of the hydroxyl groups.
Ultrasound assisted zinc reactions in synthesis 1. Efficient reduction of enones
作者:J.A.R. Salvador、M.L.Sa´ e Melo、A.S. Campos Neves
DOI:10.1016/s0040-4039(00)60587-7
日期:1993.1
Zinc reduction of α, β-unsaturated ketones in acetic acid has been efficiently accomplished under sonochemical conditions. Different α-enone systems give two kinds of products: olefins and allylic alcohols. Regio- and stereoselective are reported.
The Stereochemistry of an Elimination Reaction accompanying the Hydroboration of a Steroidal Allylic Alcohol†
作者:James R. Hanson、Mansur D. Liman、Cavit Uyanik
DOI:10.1039/a708181b
日期:——
Deuterium labelling studies have shown that the facile elimination of the 5β-hydroxy group observed in the course of hydroboration of a 5β-hydroxyandrost-3-ene may involve a trans diaxial borane-borinate elimination coupled with a syn transfer of hydrogen from the borinate.