作者:Thomas Lindel、Gregor Breckle、Matthias Hochgürtel、Christian Volk、Achim Grube、Matthias Köck
DOI:10.1016/j.tetlet.2004.09.048
日期:2004.10
Oxidative cyclization of the pyrrole-imidazole alkaloids oroidin and sventrin in DMSO/TFA (1:1) yields oxazolines via nucleophilic attack of the carbonyl oxygen at the alkenyl double bond. Oxidation takes place in the benzylic position of the imidazole ring. On prolonged reaction times, the oxazoline ring is hydrolyzed yielding the corresponding ester of pyrrole-2-carboxylic acid containing a free amino group. Overall, the double bond of oroidin is dioxygenated. (C) 2004 Elsevier Ltd. All rights reserved.