Formation of Bicyclic Pyrroles and Furans Through an Enone Allene Photocycloaddition and Fragmentation Sequence
作者:Ginger Lutteke、Rana AlHussainy、Pauli J. Wrigstedt、B. T. B. Hue、René de Gelder、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/ejoc.200701017
日期:2008.2
acetonitrile at 300 nm resulted in the clean conversion of the starting materials into a mixture of photoproducts. The major product in all cases was a bicyclic pyrrole or furan fused to an eight membered ring (43–70 % yield). The formation of these products is thought to be a result of a heteroatom-induced fragmentation of the straight adduct (7). This is supported by irradiation of the carbon analogue
Intramolecular Photoaddition of Vinylogous Amides with Allenes: A Novel Approach to the Synthesis of Pyrroles
作者:Jeffrey D. Winkler、Justin R. Ragains
DOI:10.1021/ol061453x
日期:2006.8.1
formation of either crossed photoadduct 7 (R = Ac) or parallel photoadduct 8 (R = H or alkyl) as a function of the nature of the group R. The latter result leads to a novel approach to the synthesis of pyrroles, that is, 8'.