Preparation of Homoallylic Homopropargylic Alcohols from 2-Vinyloxiranes
摘要:
beta, gamma-Unsaturated aldehydes generated in situ by treatment of 2-vinyloxiranes with a catalytic amount of Sc(OTf)3 or (BFOEt2)-O-. are effectively trapped by B-allenyl-9-BBN to afford homoallylic homopropargylic alcohols in high yield. An enantioselective version has been demonstrated, and a convenient synthesis of 9-allenyl-9-BBN is described.
Preparation of Homoallylic Homopropargylic Alcohols from 2-Vinyloxiranes
作者:Matthew L. Maddess、Mark Lautens
DOI:10.1021/ol051326l
日期:2005.8.1
beta, gamma-Unsaturated aldehydes generated in situ by treatment of 2-vinyloxiranes with a catalytic amount of Sc(OTf)3 or (BFOEt2)-O-. are effectively trapped by B-allenyl-9-BBN to afford homoallylic homopropargylic alcohols in high yield. An enantioselective version has been demonstrated, and a convenient synthesis of 9-allenyl-9-BBN is described.
Enantioselective Allylation and Crotylation of in situ Generated β,γ-Unsaturated Aldehydes
作者:Mark Lautens、J. McCubbin、Matthew Maddess
DOI:10.1055/s-0031-1289565
日期:2011.12
β,γ-Unsaturated aldehydes generated in situ by treatment of 2-vinyloxiranes with a catalytic amount of Sc(OTf)3 are effectively trapped by ring-strained allyl- and crotylsilane reagents to afford bishomoallylic alcohols as single diastereomers in high enantiomeric excess.