作者:Guillaume L.N. Peron、John Kitteringham、Jeremy D. Kilburn
DOI:10.1016/s0040-4039(99)00320-2
日期:1999.4
The Lewis acid mediated cyclisation of various methylenecyclopropyl ketones, ketals and aldehydes has been investigated as a new route to six- and seven-membered rings. Cyclisation of aldehyde 6, ketal 9 and ketone 11 with TiCl4 gave cyclohexene products, and cyclisation of ketal 10 gave a dichlorocycloheptene, all via nucleophilic addition of the methylenecyclopropyl π bond to the activated carbonyl
已经研究了路易斯酸介导的各种亚甲基环丙基酮,缩酮和醛的环化,作为通向六元和七元环的新途径。醛6,缩酮9和酮11与TiCl 4的环化反应生成环己烯产物,缩酮10的环化反应生成二氯环庚烯,都是通过将亚甲基环丙基π键亲核加成到活化的羰基上。然而,大概是通过将环丙基σ键亲核加成到活化的羰基上,将酮12与SnCl 4环化,得到环戊醇21。