A Novel, One-pot Synthesis of 2H-Benz[e]-1,3-oxazine-2-thiones†
作者:Lal Dhar S. Yadav、Sandhya Saigal、Daya R. Pal
DOI:10.1039/a800681d
日期:——
A novel, acid-catalysed cyclisation of salicylaldehyde thiosemicarbazones (1aâd) yields new 2H-benz[e]-1,3-oxazine-2-thiones (2aâd) in a one-pot procedure.
Synthesis of Some Novel Thiazolyl - Azetidinone Hybrids
作者:Chuljin Ahn、Hemant Hegde、Nitinkumar S. Shetty
DOI:10.5012/jkcs.2016.60.2.107
日期:2016.4.20
A new series of hydrazino thiazolyl-2-azetidinone 4(a-i) derivatives were synthesized efficiently using benzylidene hydrazinyl thiazole derivatives 3(a-i). The precursors, benzylidene hydrazinyl thiazoles were prepared by reacting 4- fluoro phenacyl bromide with thiosemicarbazones 2(a-i). All the structures of the synthesized compounds were ascertained by IR, NMR and mass spectral analysis
Mineral supported syntheses of benzoxazine-2-thiones under microwave irradiation
作者:Lal Dhar S. Yadav、Beerendra S. Yadav、Suman Dubey
DOI:10.1016/j.tet.2003.10.085
日期:2004.1
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.