期刊
TETRAHEDRON
卷 60, 期 1, 页码 131-136出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2003.10.085
关键词
mineral supported; microwaves; solvent free; benzoxazine-2-thiones; salicylaldehyde thiosemicarbazones
An original montmorillonite K-10 clay catalysed cycloisomerisation of salicylaldehyde 4-arylthiosemicarbazones yields 3,4-dihydro-4-hydrazino-2H-benz[e]-1,3-oxazine-2-thiones, which on reductive dehydrazination on alumina-supported copper(II) sulfate readily furnish 3,4-dihydro-2H-benz[e]-1,3-oxazine-2-thiones under solvent-free microwave irradiation. Under the same conditions salicylaldehyde thiosemicarbazones undergo cyclodehydrazination to yield 2H-benz[e]-1,3-oxazine-2-thiones. (C) 2003 Elsevier Ltd. All rights reserved.
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