Alkenenitriles: Annulations with ω-Chloro Grignard Reagents
作者:Fraser F. Fleming、Zhiyu Zhang、Qunzhao Wang、Omar W. Steward
DOI:10.1021/ol0261175
日期:2002.7.1
[reaction: see text] omega-Chloro Grignard reagents chelate with cyclic gamma-hydroxy-alpha,beta-alkenenitriles to trigger a conjugate addition-alkylation annulation. The chelation-controlled conjugate addition-alkylation is the first anionic annulation with alpha, beta-alkenenitriles, providing cis bicyclo[3.3.0]octane, hydrindane, and decalin ring systems in a single synthetic operation.
Cyclic Alkenenitriles: Synthesis, Conjugate Addition, and Stereoselective Annulation
作者:Fraser F. Fleming、Zhiyu Zhang、Qunzhao Wang、Omar W. Steward
DOI:10.1021/jo0345291
日期:2003.10.1
methylthiomethyl-protected hydroxyalkenenitriles that are easily hydrolyzed for subsequent annulations with omega-chloroalkyl Grignard reagents. Deprotonating the gamma-hydroxyalkenenitriles with t-BuMgCl followed by addition of omega-chloroalkyl Grignard reagents triggers a conjugate addition-alkylation sequence leading exclusively to cis-octalins, hydrindanes, and decalins. Stereoelectronic control favors an axial