已经开发出在催化量的偶氮二(异丁腈)作为自由基引发剂的存在下,二炔和硫代乙酸的单步分子内自由基级联反应以合成噻吩。该方法允许容易且有效地构建具有3,4-稠环取代和未取代的2,5-位的噻吩支架,用于进一步的官能化和聚合。使用该方法,合成了环戊[ c ]噻吩,3,4-乙撑二氧噻吩和含噻吩的螺环化合物的衍生物。
Indane-2-mercaptoacetylamide disulfide derivatives useful as inhibitors
申请人:Merrell Pharmaceuticals Inc.
公开号:US05604221A1
公开(公告)日:1997-02-18
The present invention relates to certain novel indane-2-mercaptoacetylamide disulfide derivatives of the formula ##STR1## useful as inhibitors of enkephalinase.
Silver-Mediated [2 + 2 + 1] Cyclization Reaction of Diynes with Elemental Selenium/Sulfur To Synthesize 3,4-Substituted Cyclopenta[<i>c</i>]selenophenes/Cyclopenta[<i>c</i>]thiophenes
作者:Ye Wang、Yang Yuan、Zongkang Wang、Yingge Gu、Siyi Fu、Lingkai Kong、Yanzhong Li
DOI:10.1021/acs.orglett.1c02018
日期:2021.8.6
An efficient and atom-economical silver-mediated [2 + 2 + 1] cyclization protocol for the synthesis of 3,4-fused-ring-substituted and 2,5-unsubstituted selenophenes or thiophenes has been developed. Two C–Se/C–S bonds and one C–C bond were rapidly constructed in one step. Readily accessible substrates, commercially available elemental selenium/sulfur, and good functional group tolerance make this procedure
place with terminal alkynes. Herein, we report that comparable rate enhancements, in nature and level, are induced by copper and silver catalysts in the intramolecular (3 + 2) cycloaddition of terminal alkynes with “neutral” three-atom components (TACs), specifically alkynyl sulfides. Through careful observations amidst reaction optimization, experimental, and DFTmechanisticstudies, a pathway involving