Diastereoselective synthesis of 3,6-dihydro-2H-1,3,4-thiadiazines
摘要:
Thionation of the benzil hydrazones 3 with Lawesson's reagent afforded the 3,6-dihydro-2H-1,3,4-thiadiazines 4 by an intramolecular cyclisation. This reaction was shown to be diastereospecific and allowed the formation of the exo compounds 4b-e. When the homochiral SAMP-hydrazone 3f was used, the reaction afforded enantiomerically pure (4R,6R,9S)-4f. (C) 1998 Elsevier Science Ltd. All rights reserved.
A Convenient Synthesis of 3-Alkyl-6-trifluoromethyl-3,6-dihydro-2<i>H</i>-1,3,4-thiadiazines
作者:Yasuhiro Kamitori、Masaru Hojo、Ryōichi Masuda、Yoshihiko Kawamura、Tōru Numai
DOI:10.1055/s-1990-26915
日期:——
3-Dialkylhydrazono-1,1,1-trifluoro-2-alkanones 2, readily obtainable from the reaction of substituted benzaldehyde, propanal and formaldehyde dialkylhydrazones with trifluoroacetic anhydride, afford title compounds 5 in satisfactory yields on treatment with Lawesson reagent in refluxing benzene.
Synthesis of .beta.-lactams via cycloaddition of hydrazones with phenoxyketene
作者:S. D. Sharma、S. B. Pandhi
DOI:10.1021/jo00294a040
日期:1990.3
Domnin et al., Zhurnal Obshchei Khimii, 1958, vol. 28, p. 1469,1473, 1474; engl. Ausg. S. 1520, 1523
作者:Domnin et al.
DOI:——
日期:——
SHARMA, S. D.;PANDHI, S. B., J. ORG. CHEM., 55,(1990) N, C. 2196-2200
作者:SHARMA, S. D.、PANDHI, S. B.
DOI:——
日期:——
Diastereoselective synthesis of 3,6-dihydro-2H-1,3,4-thiadiazines
作者:Jean-Damien Charrier、Alain Reliquet、Jean Claude Meslin
DOI:10.1016/s0957-4166(98)00108-6
日期:1998.5
Thionation of the benzil hydrazones 3 with Lawesson's reagent afforded the 3,6-dihydro-2H-1,3,4-thiadiazines 4 by an intramolecular cyclisation. This reaction was shown to be diastereospecific and allowed the formation of the exo compounds 4b-e. When the homochiral SAMP-hydrazone 3f was used, the reaction afforded enantiomerically pure (4R,6R,9S)-4f. (C) 1998 Elsevier Science Ltd. All rights reserved.