Studies toward the Total Synthesis of Clavulactone
作者:Qiang Zhu、Lixin Qiao、Yikang Wu、Yu-Lin Wu
DOI:10.1021/jo005683f
日期:2001.4.1
Synthetic studiesdirectedtoward a totalsynthesis of clavulactone are reported. In light of the analysis made in our previous work, cyclopentane 4a (a key intermediate in the present work) was synthesized through a radical-mediated ring closure of a rationally designed substrate 25. Using HWE reactions, the lower and upper side-chains of 4a were converted into an allyl chloride and an allyl cyanohydrin
A directing effect of neighboring aromatic groups on the regiochemistry of formation and stereochemistry of alkylation and bromination of ketone lithium enolates. Evidence for lithium-arene coordination and dramatic effect of copper(I) in controlling stereochemistry and limiting polyalkylation