期刊
TETRAHEDRON
卷 62, 期 29, 页码 6774-6781出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2006.05.001
关键词
microwave; U-4CR; 2-aminophenols; 1,4-benzoxazines; annulation
The one-pot U-4CR and intramolecular O-alkylation sequence starting from 2-aminophenols in combination with alpha-bromoalkanoic acids, aldehydes, and isocyanides under controlled microwave heating has been established for a rapid access to highly functionalized 3,4-dihydro-3-oxo-2H-1,4-benzoxazines. With appropriate substitutions on the 1,4-benzoxazines, a microwave-assisted Cu-catalyzed intramolecular amidation was performed to furnish a novel class of heterocyclic conjugates of 1,4-benzoxazines with a 2-oxindole linked through a C-N single bond. (c) 2006 Elsevier Ltd. All rights reserved.
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