Journal
TETRAHEDRON
Volume 69, Issue 47, Pages 9951-9956Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2013.09.072
Keywords
Pyrrole; Benzoxazines; Indole; Oxidative cyclization; Lactones
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The hitherto unknown lactone 5H-pyrrolo[1,2-a][3,1]benzoxazin-5-one and six of its substituted derivatives have been prepared by active manganese dioxide promoted oxidative cyclization of the corresponding 2-(1H-pyrrol-1-yl)benzoic acids, under mild conditions, in moderate yields. The method was successfully extended to the cyclization of some ortho-(1H-pyrrol-1-yl)heteroaryl carboxylic acids and 2-(1H-indol-1-yl)benzoic acids. (C) 2013 Elsevier Ltd. All rights reserved.
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