Catalytic Cyclothiomethylation of Diamides and Dihydrazides of (Thio)carbonic Acid Using Bis(dimethylamino)methane, H2S, and Na2S·9H2O
摘要:
An efficient method for the synthesis of N,S-heterocycles with (thio)amide fragments by the catalytic cyclothiomethylation of diamides and dihydrazides of (thio)carbonic acid with H2S, sodium sulfide crystallohydrate, or bis(dimethylamino)methane has been developed.
Catalytic Cyclothiomethylation of Diamides and Dihydrazides of (Thio)carbonic Acid Using Bis(dimethylamino)methane, H2S, and Na2S·9H2O
作者:R. R. Khairullina、T. V. Tyumkina、Е. S. Meshcheryakova、А. G. Ibragimov
DOI:10.1134/s1070428020020165
日期:2020.2
An efficient method for the synthesis of N,S-heterocycles with (thio)amide fragments by the catalytic cyclothiomethylation of diamides and dihydrazides of (thio)carbonic acid with H2S, sodium sulfide crystallohydrate, or bis(dimethylamino)methane has been developed.
Multicomponent reactions of urea and its derivatives with CH2O and H2S in the synthesis of 1,3,5-thiadiazinane-4-(thi)ones and macroheterocycles
作者:Vnira R. Akhmetova、Regina R. Khairullina、Ivan S. Bushmarinov、Tat’yana V. Tyumkina、Vasiliy M. Yanybin
DOI:10.3998/ark.5550190.0012.811
日期:——
A convenient, efficient, and practical method for the synthesis of 1,3,5-thiadiazinan-4-(thi)ones via a multicomponent condensation of urea (or thiourea), formaldehyde and hydrogen sulfide in the presence of a four-fold molar excess of n-BuONa is described. It provides the novel acid(H2SO4) and base(n-BuONa)-promoted approach for the one-pot synthesis of the amidine containing macroheterocycles from