Triggering of the Bergman Cyclization by Photochemical Ring Contraction. Facile Cycloaromatization of Benzannulated Cyclodeca-3,7-diene-1,5-diynes
作者:Grigori V. Karpov、Vladimir V. Popik
DOI:10.1021/ja064470q
日期:2007.4.1
α-diazo-β-diketone moiety, undergoes efficient light-induced ring contraction to produce two isomeric ten-membered ring enediyne compounds. The latter undergo spontaneous facile Bergman cyclization at or below room temperature. In the photochemical or thermal Wolff rearrangement of 1, the alkyl substituent migrates ca. 2 times faster than the alkynyl group.