期刊
TETRAHEDRON LETTERS
卷 51, 期 16, 页码 2148-2150出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2010.02.075
关键词
3-Oxidopyrylium; [5+2] Cycloaddition; Ketoxime; Beckmann fragmentation; Furopyran
An elegant approach for stereocontrolled synthesis of furopyran (hexahydro-2H-furo[3,2-b]pyran) building blocks was reported. The key steps in the sequence involved an efficient intramolecular 3-oxidopyrylium-alkene [5+2] cycloaddition for the synthesis of cycloadduct 6 and Beckmann fragmentation of ketoxime 13 to yield the furopyrans (5a-c). (c) 2010 Elsevier Ltd. All rights reserved.
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