S-(+)-carvone as starting material in synthesis (part 4). Conjugate addition of cyanide and Grignard nucleophiles followed by annulation to functionalized decalones.
摘要:
Two conjugate addition/annulation methodologies for S-(+)-carvone are reported. The conjugate addition of Grignard reagents, followed by the Lewis acid catalyzed Michael reaction of the intermediate silyl enol ethers with MVK and cyclization of the diketones, gave decalones 2a-d stereoselectively and in good yield. The conjugate addition of cyanide anion followed by base catalyzed Robinson annulation with MVK and dehydration gave decalone 2e stereoselectively in very high yield.
S-(+)-carvone as starting material in synthesis (part 4). Conjugate addition of cyanide and Grignard nucleophiles followed by annulation to functionalized decalones.
摘要:
Two conjugate addition/annulation methodologies for S-(+)-carvone are reported. The conjugate addition of Grignard reagents, followed by the Lewis acid catalyzed Michael reaction of the intermediate silyl enol ethers with MVK and cyclization of the diketones, gave decalones 2a-d stereoselectively and in good yield. The conjugate addition of cyanide anion followed by base catalyzed Robinson annulation with MVK and dehydration gave decalone 2e stereoselectively in very high yield.
S-(+)-carvone as starting material in synthesis (part 4). Conjugate addition of cyanide and Grignard nucleophiles followed by annulation to functionalized decalones.
作者:Anja A. Verstegen-Haaksma、Henk J. Swarts、Ben J.M. Jansen、Aede de Groot
DOI:10.1016/s0040-4020(01)89623-x
日期:1994.1
Two conjugate addition/annulation methodologies for S-(+)-carvone are reported. The conjugate addition of Grignard reagents, followed by the Lewis acid catalyzed Michael reaction of the intermediate silyl enol ethers with MVK and cyclization of the diketones, gave decalones 2a-d stereoselectively and in good yield. The conjugate addition of cyanide anion followed by base catalyzed Robinson annulation with MVK and dehydration gave decalone 2e stereoselectively in very high yield.