Chiral synthesis via organoboranes. 36. Exceptionally enantioselective allylborations of representative heterocyclic aldehydes at -100 .degree.C under salt-free conditions
作者:Uday S. Racherla、Yi Liao、Herbert C. Brown
DOI:10.1021/jo00050a045
日期:1992.11
Chiral terpenyl-based allylborane reagents (Ter2*BCH2CH=CH2, 1-3) undergo facile condensation with representative heterocyclic aldehydes (HetCHO) at -100-degrees-C (in the absence of Mg2+ salts) and afford the corresponding homoallylic alcohols (HetCH*(OH)CH2CH=CH2,12-19) in enantiomeric purities approaching 100% ee. A new workup procedure involving 8-hydroxyquinoline (8-HQ) has been utilized for the convenient isolation of the product alcohols.
BROWN, HERBERT C.;RACHERLA, UDAY S.;PELLECHIA, PERRY J., J. ORG. CHEM., 55,(1990) N, C. 1868-1874
作者:BROWN, HERBERT C.、RACHERLA, UDAY S.、PELLECHIA, PERRY J.
DOI:——
日期:——
RACHERLA, UDAY S.;BROWN, HERBERT C., J. ORG. CHEM., 56,(1991) N, C. 401-404
作者:RACHERLA, UDAY S.、BROWN, HERBERT C.
DOI:——
日期:——
The Total Synthesis of the Oxopolyene Macrolide RK-397
作者:Mark J. Mitton-Fry、Aaron J. Cullen、Tarek Sammakia