hydroxyalkylation of allylic N-methyl sulfoximines 1–4 gave with ≥ 95% de the anti-Z-configurated homoallylic alcohols 5–9. Lithiation of 6b and 8b with MeLi readily produced the lithiated vinylic sulfoximines (Z)-12 and (Z)-13, respectively. Ni-catalyzed substitution of (Z)-12 and (Z)-13 with PhLi and 1,5-silyl migration yielded with ≥ 98% de the disubstituted C-silylated homoallylic alcohols (Z)-14 and (Z)-15
Total synthesis of (+)-spatol. A stereospecific construction of vicinal diepoxides from 2,3-epoxy-1,4-diols
作者:Robert G. Salomon、Basudeb Basu、Subhas Roy、Ram B. Sharma
DOI:10.1016/s0040-4039(01)80758-9
日期:1989.1
A totalsynthesis of (+)-spatol (1) was achieved which depends upon a novel stereospecific transformation of trans-2,3-epoxy-1,4-diols to generate the sensitive allylic vicinal cis-diepoxide in 1.