A New and Concise Synthesis of 3-Aryl- and 3-Alkyl-1<i>H</i>-2-benzothiopyran-1-ones (Thioisocoumarins)
作者:Axel Couture、Hélène Cornet、Pierre Grandclaudon
DOI:10.1055/s-1990-27113
日期:——
3-Aryl- and 3-alkyl-1H-2-benzothiopyran-1-ones are readily accessible by reaction of the lithiated N,N-diethyl-o-toluamide (N,N-diethyl-2-methylbenzenecarboxamide) with appropriate aromatic, heteroaromatic and aliphatic thioesters.
A general and efficient strategy for the one-pot synthesis of isothiocoumarin-1-ones has been developed via the base-promoted 6-endo-dig thioannulation of o-alkynyl oximeethers using the cheap and readily available Na2S as the sulfur source. Mechanisticstudies disclosed that the reaction proceeded through two C–S bond formations, N–O bond cleavage and the final hydrolysis of imines.
使用廉价且易于获得的 Na 2 S 作为硫源,通过碱促进的 6 -endo-dig硫环化邻炔基肟醚,开发了一种通用且有效的一锅法合成异硫香豆素-1-酮的策略. 机理研究表明,该反应通过两个 C-S 键形成、N-O 键断裂和亚胺的最终水解进行。
3-取代异硫香豆素衍生物的合成方法
申请人:温州大学
公开号:CN113735821B
公开(公告)日:2022-06-17
本发明涉及一种3‑取代异硫香豆素衍生物的合成方法,包括以下步骤:以邻炔基肟醚为反应底物,硫化钠为硫源,碳酸钾作碱,N,N‑二甲基甲酰胺作溶剂,于90 oC搅拌反应12‑16小时,反应结束后向其加入1.2 mL 1 M HCl室温继续搅拌1小时。具有原料简单易得、反应条件相对温和、底物普适性广,制备工艺新颖、污染少、耗能低等优点。
COUTURE, AXEL;CORNET, HELENE;GRANDCLAUDON, PIERRE, SYNTHESIS (BRD),(1990) N2, C. 1133-1134
作者:COUTURE, AXEL、CORNET, HELENE、GRANDCLAUDON, PIERRE