Synthetic Studies and Mechanistic Insight in Nickel-Catalyzed [4+2+1] Cycloadditions
作者:Yike Ni、John Montgomery
DOI:10.1021/ja057741q
日期:2006.3.1
with alkynes tethered to dienes has been developed. A broad range of unsaturated substrates participate in the sequence, and stereoselectivities are generally excellent. Stereochemicalstudies provided evidence for a mechanism that involves the [3,3] sigmatropicrearrangement of divinylcyclopropanes.
Stereochemical Control in Intramolecular Ene Reactions of Crotyl Propargyl Ether Systems
作者:Koichi Mikami、Kazuhiko Takahashi、Takeshi Nakai
DOI:10.1246/cl.1987.2347
日期:1987.12.5
Stereochemical features are described of the title reactions leading to the γ-alkylidene-β-vinyloxolanes. Of particular interest is the high 1,2-trans diastereoselectivity observed for the (α-alkyl)crotyl and (α,β-dialkyl)crotyl ether systems with methoxycarbonyl group at the acetylenic terminus which remarkably facilitates the ene cyclization.