Regioselectivity in the Hydroboration of Steroidal Δ3-Allylic Alcohols†
作者:Muzaffar Alam、James R. Hanson、Mansur Liman、Sivajini Nagaratnam
DOI:10.1039/a605946e
日期:——
The presence of an allylic 5α-hydroxy group in an androst-3-ene increases the proportion of addition of a borane to the adjacent C-4 compared to the unsubstituted steroid and directs the addition to the face of the alkene anti to the hydroxy group with stereochemical effects that may oppose those of the C-10β-methyl group.