Mmm, a reaction sandwich…︁ Using an immunoassay‐based technique able to monitor any kind of cross‐coupling reaction, a systematic and rapid evaluation of a large panel of random reactions was carried out. This approach led to the discovery of two new copper‐promoted reactions: a desulfurization reaction of thioureas leading to isoureas and a cyclization reaction leading to thiazole derivatives from
Synthetic Studies toward Aryl-(4-aryl-4<i>H</i>-[1,2,4]triazole-3-yl)-amine from 1,3-Diarylthiourea as Urea Mimetics
作者:Amarnath Natarajan、Yuhong Guo、Haribabu Arthanari、Gerhard Wagner、Jose A. Halperin、Michael Chorev
DOI:10.1021/jo0508189
日期:2005.8.1
4]triazole-3-yl-amines as urea mimetics from the corresponding 1,3-disubstituted thioureas has been studied, and the scope and limitations of this reaction are presented. The reaction proceeds through the formation of a carbodiimide, followed by a sequential addition−dehydration with acyl hydrazides. 1,3-Branched dialkylthioureas result in the formation of the corresponding ureas. The electronic and steric
The HgCl2-promoted guanylation reaction: The scope and limitations
作者:Catherine Levallet、Joanne Lerpiniere、Soo Y Ko
DOI:10.1016/s0040-4020(97)00193-2
日期:1997.4
The HgCl2-promoted guanylation reaction was studied with various substituted thiourea starting materials and the scope and limitations are presented. The process was found to be effective with thioureas containing at least one N-conjugated substituent. Such activating groups include N-carbonyl- (acyl, alkoxycarbonyl, carbamoyl, etc.), N-cyano-, N-sulfonyl-, and N-aryl- substituents.
A simple and efficient method for constructing thiohydantoin heterocycles using a phosphine-catalyzed tandem umpolung addition and intramolecular cyclization of thioureas on arylpropiolates is described.
6-cycloheptatrien-1-one (method B). Some of the compounds 3 and 4 exhibited potent antiinflammatory and analgesicactivities when compared to timegadine (1) or tiaramide hydrochloride (HCl) (17). It was of interest that 1-(2-benzothiazolyl)-2-cyclohexylimino-1,2-dihydrocycloheptimid azole (4e) showed superior analgesicactivity to timegadine or tiaramide HCl (ED50 = 1.7 mg/kg p.o. in the acetic acid-induced
合成了2-氨基-1H-苯并咪唑(3)和1,2-二氢-2-亚氨基环庚咪唑(4),并评估了其抗炎和镇痛活性。系列3的化合物是通过苯硫脲(6)或2-氯-1H-苯并咪唑(12)合成的。4种化合物中的大多数是通过两种方法合成的。一种是碳二亚胺(14)与2-氨基-2,4,6-环庚三烯-1-酮(方法A)的反应。另一个是胍(15)与2-氯-2,4,6-环庚三烯-1-酮(方法B)的反应。与时加定(1)或盐酸替拉酰胺(HCl)(17)相比,某些化合物3和4具有较强的抗炎和镇痛作用。有趣的是1-(2-苯并噻唑基)-2-环己基氨基-1,2-二氢环庚咪唑(4e)的镇痛活性优于timegadine或tiaramide HCl(ED50 = 1.7 mg / kg po