1,4 Additions with lithium bis(methylenecyclopropyl)cuprate
作者:Guillaume Peron、David Norton、John Kitteringham、Jeremy D Kilburn
DOI:10.1016/s0040-4039(00)01957-2
日期:2001.1
Addition of lithium bis(methylenecyclopropyl) cuprate to α,β-unsaturated ketones provides an efficient route to methylenecyclopropylketones which on treatment with TiCl4 give a range of cyclised products.
Lewis acid mediated cyclisation of methylenecyclopropyl ketones and aldehydes
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