Chloro(bromo)vinyl ketones and 2,2-Dichloroacrolein in Reactions with Hydrazines
摘要:
Reactions of 2,2-dichlorovinyl and 2,2-dibromovinyl ketones with alkylhydrazines afford respectively 1-R-3-alkyl(aryl)-5-chloro- or 5-bromopyrazoles in preparative yields. The dichloroacrolein forms with alkylhydrazines and dimethylhydrazine only the corresponding hydrazones. Quantum-chemical calculations were performed characterizing the structure of the obtained ketones and dichloroacrolein C, alkylhydrazones, of dichloroacrolein dimethylhydrazone, of 1-alkyl-5-chloropyrazolinium halides, and 1-alkyl-5-chloropyrazoles.
Synthesis and reactions of 1-benzyl-3-haloalkyl-5-chloropyrazoles
作者:E. V. Rudyakova、V. A. Savosik、I. T. Evstaf’eva、E. V. Kondrashov、G. G. Levkovskaya
DOI:10.1134/s1070428009050108
日期:2009.5
pyrazoles reacted with indole and pyrrole in DMSO in the presence of alkali to give 3-(heter-1-yl)alkyl-substituted 1-benzyl-5-chloropyrazoles. 1-[(1-Benzyl-5-chloropyrazol-3-yl)methyl]indole reacted regiospecifically with chloroal trifluoromethylsulfonyl- and 4-chlorophenylsulfonylimines providing the products of C-amidotrichloroethylation into the position 3 of the indole ring. 1-[(1-Benzyl-5-c
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作者:Levkovskaya, G. G.、Mirskova, A. N.、Drozdova, T. I.、Kalikhman, I. D.、Bannikova, O. B.、Voronkov, M. G.
DOI:——
日期:——
Reactions of ketene acetals. 10. Total syntheses of the anthraquinones rubrocomatulin pentamethyl ether, 2-acetylemodin, 2-acetyl-5-hydroxyemodin tetramethyl ether, and xanthorin
作者:Jean Louis Grandmaison、Paul Brassard
DOI:10.1021/jo00401a031
日期:1978.3
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作者:Atavin,A.S. et al.
DOI:——
日期:——
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