Reactions of 4-chloro-5<i>h</i>-1,2,3-dithiazole-5-thione with α,β-unsaturated β-amino esters: Formation of 2-[2-(1-alkenylsulfanyl-1-alkoxycarbonyl-2-amino)-1,2-dicyano-vinylsulfanyl]-3-amino-2-alkenoic alkyl esters
作者:Yong-Goo Chang、Kyongtae Kim、Yung Ja Park
DOI:10.1002/jhet.5570390103
日期:2002.1
Treatment of 4-chloro-5H-1,2,3-dithiazole-5-thione with alkyl 3-alkyl (or aryl)-3-amino-2-propenoates in the presence of pyridine (2 equivalents) in dichloromethane at reflux gave 2-[2-(1-alkenylsulfanyl-1-alkoxy-carbonyl-2-amino)-1,2-dicyanovinylsulfanyl]-4 and-1,2-dicyanovinyldisulfanyl]-3-amino-2-alkenoicalkylesters 7 in 16 to 60% and 8 to 48% yields, respectively.
在吡啶(2当量)在二氯甲烷中回流下,用3-烷基(或芳基)-3-氨基-2-丙烯酸烷基酯处理4-氯-5 H -1,2,3-二噻唑-5-硫酮得到2- [2-(1- alkenylsulfanyl-1-烷氧基羰基-2-氨基)-1,2- dicyanovinylsulfanyl] - 4和-1,2- dicyanovinyldisulfanyl] -3-氨基-2-链烯酸烷基酯7在产率分别为16%至60%和8%至48%。
Regioselective Synthesis of <i>N</i><sup>2</sup>-Aryl 1,2,3-Triazoles via Electro-oxidative Coupling of Enamines and Aryldiazonium Salts
作者:Mrinmay Baidya、Samrat Mallick、Suman De Sarkar
DOI:10.1021/acs.orglett.1c04099
日期:2022.2.18
An efficient syntheticroute for the construction of N2-aryl 1,2,3-triazoles is reported via sequential C–N bond formation and electro-oxidative N–N coupling under metal-free conditions. Readily accessible 2-aminoacrylates and aryldiazonium salts were used as starting materials, and the developed protocol displays excellent functional group tolerance, allowing an extensive range of substrate scope
Reactivity of<i>p</i>-phenyl substituted β-enamino compounds using k-10/ultrasound. I. synthesis of pyrazoles and pyrazolinones
作者:Claudete J. Valduga、Hugo S. Braibante、Mara E. F. Braibante
DOI:10.1002/jhet.5570350136
日期:1998.1
The reactivity of the β-enamino ketones, 3-amino-1-(p-phenyl-substituted)-2-buten-1-ones 1a-d and β-enamino esters. Ethyl-3-amino-3-(p-phenyl-substituted)-2-propenoates 5a-d were evaluated by systematic studies of the reactions with hydrazine and methylhydrazine by reactions with solid support K-10/ultrasound and homogeneous media (reflux in ethanol or dichloromethane) yielding pyrazole rings 2a-d
Reactivity of<i>p</i>-phenyl substituted β-enamino compounds using K-10/ultrasound.<b>I</b>. Synthesis of pyrazoles and pyrazolinones
作者:Claudete J. Valduga、Hugo S. Braibante、Mara E. F. Braibante
DOI:10.1002/jhet.5570340513
日期:1997.9
The reactivity of the β-enamino ketones, 3-amino-1-(p-phenyl-substituted)-2-buten-1-ones 1a-d and β-enamino esters, ethyl 3-amino-3-(p-phenyl-substituted)-2-propenoates 5a-d was systematically studied when allowed to react with hydrazine and methylhydrazine under solid support K-10/ultrasound conditions and in homogeneous media (reflux in ethanol or dichloromethane). The products were pyrazoles 2a-d
Constituents of Tropical Medicinal Plants, LXIII: Synthesis of 2-Methoxyonychine Alkaloids - Structure Revision of Oxylopidine
作者:Hans Achenbach、Andreas Schwinn
DOI:10.1002/ardp.19943271202
日期:——
were cyclized by polyphosphoric acid to yield the corresponding 2‐methoxyonychines. By this method a number of 2‐methoxy‐substituted onychines were prepared for the first time, i.a. oxylopidine, the structure of which has to be revised.