α-Carbonyl Radical Cyclization Approach toward Angular Triquinanes: Total Synthesis of Enantiomerically Pure (−)-5-Oxosilphiperfol-6-ene
作者:Chin-Kang Sha、K. C. Santhosh、Shin-Hong Lih
DOI:10.1021/jo9723570
日期:1998.4.1
An alpha-carbonyl radical cyclization approach toward synthesis of angular triquinanes is described. As a model study, conjugateaddition of 4-(trimethylsilyl)-3-butynylmagnesium chloride to enone 7 followed by trapping of the enolate with chlorotrimethylsilane gave trimethysilyl enolether 8. Iodination of 8 with a mixture of NaI and m-CPBA afforded iodo ketone 6. Radical cyclization of 6 effected