NBS-mediated sequential one-pot synthesis of multifunctionalized thiazoles and thiophenes from 1,3-dicarbonyl compounds and mercaptonitrile salts
作者:Laichun Luo、Lanlan Meng、Qi Sun、Zemei Ge、Runtao Li
DOI:10.1016/j.tetlet.2013.11.014
日期:2014.1
A NBS-mediated sequential one-pot synthesis of multifunctionalized thiazoles and thiophenes from 1,3-dicarbonyl compounds and mercaptonitrile salts has been developed under mild conditions. This transformation involves sequential bromination/SN2 alkylation/Thorpe–Zieglercyclization/regio-selective elimination of a –COR group, affording the desired products in moderate to good yields. The sequence
由NBS介导的从1,3-二羰基化合物和硫醇腈盐开始的多官能噻唑和噻吩的顺序一锅法合成已经在温和的条件下进行。该转化涉及顺序溴化/ S N 2烷基化/索普-齐格勒环化/ -COR基团的区域选择性消除,以中等至良好的收率提供所需的产物。确定了-COR基团离去反应的顺序,并提出了可能的机制。
An efficient method for the synthesis of thieno[3′,2′:2,3]pyrido-[4,5-d]-thiazolo[3,2-a]pyrimidinones
An efficient method for the preparation of thieno[3′,2′:2,3]pyrido[4,5-d]thiazolo[3,2-a] pyrimidin-5-ones 5 is described. The key intermediate, 7-(3-amino-4-cyano-5-phenyl aminothieno-2-yl)-5H-thiazolo-[3,2-a]pyrimidin-5-one (3), was synthesized from 7-chloromethyl-5H-thiazolo[3,2-a]pyrimidin-5-one (1) with potassium-(2,2-dicyano-1-phenylaminoethen-1-yl)thiolate (2) by Thorpe–Ziegler isomerization
Synthesis of new heterocycles festooned with thiophene and evaluating their antioxidant activity
作者:Nader A. Abed、Mohamed M. Hammouda、Mohamed A. Ismail、Ehab Abdel‐Latif
DOI:10.1002/jhet.4122
日期:2020.12
trile was achieved to obtain the target dithien‐2‐yl ketone 28. The new synthesized scaffolds were examined for their antioxidant activity by means of ABTS antioxidant assay. The thienyl‐thiazole scaffold 18c and 2‐((2‐[thiophen‐2‐yl]‐2‐oxoethyl)thio)nicotinonitrile derivative 27 displayed a reasonable radical scavenging activity.
2-cyanoethylene-1-thiolate salt with 2,3,4,6-tetra-O-acetyl-α-D-gluco- and galactopyranosyl bromides affords a new class of cyanoethylene thioglycosides. The conversion to the corresponding 5-aminopyrazoles confirms the E-configuration of these cyanoethylene thioglycosides.
摘要 2-氰基乙烯-1-硫醇钠盐与 2,3,4,6-四-O-乙酰基-α-D-葡糖-和吡喃半乳糖基溴化物的一锅反应提供了一类新的氰基乙烯硫糖苷。转化为相应的 5-氨基吡唑证实了这些氰基乙烯硫糖苷的 E 构型。
A convenient method for synthesis of bis-2,2′-(1,3,4-thiadiazole) and bis-3,3′-(1,2,4-triazole) derivatives
作者:Ahmad S. Shawali、Abdelwahed R. Sayed、Mohie M. Zayed
DOI:10.1080/17415993.2011.586456
日期:2011.8
the bis-hydrazonoyl chloride 1 with ketene N,S-acetal 2 and the active methine thioanilides 4 and 6 provide a new convenient site-selective synthetic strategy to functionalized bis-3,3′-(1,2,4-triazoles) 3 and bis-2,2′-(1,2,4-thiadiazoles) 5 and 7.