开发了 2,5-二取代-1,3,4-噻二唑和 1,3,4-恶二唑的酸催化区域选择性环化反应。合成的前体2-(甲硫基)-2-硫代乙酸烷基酯/2-氨基-2-硫代乙酸烷基酯与酰肼有效反应,利用p-TSA和AcOH通过区域选择性环化转化为一系列脱水和脱硫产物过程。2-氨基-2-硫代乙酸烷基酯途径在上述方法中产生优异的产率。所报道的方法在无金属条件下操作简单且高效,并且表现出显着的官能团兼容性。通过单晶 X 射线衍射研究证实了区域选择性环化产物。
Redox-Switchable Phase Tags – Facile Mitsunobu Reactions using Ferrocenyl-Tagged Triphenylphosphine
作者:Christoph A. Fleckenstein、Herbert Plenio
DOI:10.1002/adsc.200606024
日期:2006.6
The use of redox-switched phasetags in ferrocenyl-substituted triphenylphosphine combined with DBAD (di-tert-butyl azodicarboxylate) allows high yield (>90 %) Mitsunobu transformations without the need for the chromatographic purification of the products. The redox-switchable phosphine can be easily synthesized in two steps from 4-bromoaniline, ferrocene and chlorodiphenylphosphine. It is separated
Regioselective Synthesis of 2,5-Disubstituted-1,3,4-thiadiazoles and 1,3,4-Oxadiazoles via Alkyl 2-(Methylthio)-2-thioxoacetates and Alkyl 2-Amino-2-thioxoacetates
作者:Chikkappaiahnayaka Santhosh、Krishna Ravi Singh、Kalleshappa Sheela、Toreshettahally R. Swaroop、Maralinganadoddi P. Sadashiva
DOI:10.1021/acs.joc.3c00589
日期:2023.8.18
and 1,3,4-oxadiazoles has been developed. The synthetic precursors alkyl 2-(methylthio)-2-thioxoacetates/alkyl 2-amino-2-thioxoacetates react efficiently with acyl hydrazides, which transformed into a series of dehydrative and desulfurative products with employment of p-TSA and AcOH through a regioselective cyclization process. The alkyl 2-amino-2-thioxoacetate pathway generates excellent yield among
开发了 2,5-二取代-1,3,4-噻二唑和 1,3,4-恶二唑的酸催化区域选择性环化反应。合成的前体2-(甲硫基)-2-硫代乙酸烷基酯/2-氨基-2-硫代乙酸烷基酯与酰肼有效反应,利用p-TSA和AcOH通过区域选择性环化转化为一系列脱水和脱硫产物过程。2-氨基-2-硫代乙酸烷基酯途径在上述方法中产生优异的产率。所报道的方法在无金属条件下操作简单且高效,并且表现出显着的官能团兼容性。通过单晶 X 射线衍射研究证实了区域选择性环化产物。