Diastereoselective Titanocene-Catalyzed Oxidative Cyclization of Bishomoallylic Alcohols
作者:Alessandra Lattanzi、Giorgio Della Sala、Maurizio Russo、Arrigo Scettri
DOI:10.1055/s-2001-16779
日期:——
Bishomoallylic alcohols are converted in good yields and diastereoselectivity into tetrahydrofuranols and tetrahydropyranols by Cp2TiCl2/t-butyl hydroperoxide/activated 4 Å molecular sieves system.
An efficient methodology for the stereoselectivesynthesis of cis‐2,5‐disubstituted pyrrolidines using copper catalyst was developed. The corresponding cis‐2,5‐disubstituted pyrrolidines could be obtained in reasonable yields and with good stereoselectivities in the presence of 4,4′‐di‐tert‐butyl‐2,2′‐bipyridine as ligand and 1‐methyl‐2‐pyrrolidinone as solvent.
Highly Efficient Chemical Kinetic Resolution of Bishomoallylic Alcohols: Synthesis of (<i>R</i>)-Sulcatol
作者:Shui-Ling Chen、Qi-Ying Hu、Teck-Peng Loh
DOI:10.1021/ol048608q
日期:2004.9.1
A highly efficient chemical kinetic resolution of bishomoallylic alcohols was developed when the alcohols underwent In(OTf)(3)-catalyzed 3,5-oxonium-ene-type cyclization with steroidal aldehyde 2. Consistently high enantiomeric excess (up to >99%) was obtained.
MICHAEL, J. P.;TING, P. C.;BARTLETT, P. A., J. ORG. CHEM., 1985, 50, N 14, 2416-2423