设计了基于温和自由基的偶联方法用于分子间安装季碳。在室温下用Et 3 B / O 2处理α,α-二烷氧基酰基碲化碲促进了高反应性α,α-二烷氧基碳自由基的形成,该自由基与2-氰基-3-甲基-2-环己烯-1-偶联一个在四取代碳原子和四碳原子中心之间建立空间繁琐的键。本收敛策略已成功应用于5- Epi -eudesm-4(15)-ene-1β,6β-diol(1)的七步全合成。
Palladium(ii) acetate mediated oxidative cyclization of ω-unsaturated α-cyano ketones for facile construction of methylenecyclohexane ring system
作者:Min-Tsang Hsieh、Kak-Shan Shia、Hsing-Jang Liu、Sheng-Chu Kuo
DOI:10.1039/c2ob25161b
日期:——
construction of the structurally attractive methylenecyclohexane ring was developed through a convenient 1,4-addition of 4-pentenylmagnesium bromide to 2-cyano-2-cycloalkenones followed by a Pd(II)-mediated oxidative cyclization of the resulting ω-unsaturated α-cyano ketones. Based on this newly developed protocol, polycyclic adducts bearing various ring sizes and substitutions can be prepared in moderate to