Assembly of Benzo[<i>c</i>][1,2]dithiol-3-ones via Acid-Promoted Denitrogenative Transannulation of Benzotriazinones
作者:Yao Zhou、Bohao Zhang、Junjie Dong、Jingnan Li、Shanhong Yang、Likun Ye
DOI:10.1021/acs.orglett.2c03638
日期:2022.12.16
An expedientsynthesis of benzo[c][1,2]dithiol-3-ones via metal-free denitrogenative transannulation of benzotriazinones is developed, which represents the first example of acid-mediated heteroannulation of benzotriazinones. This newly discovered reactivity of benzotriazinones enables the streamline synthesis of diverse benzo[c][1,2]dithiol-3-ones in decent yields by using sodium sulfide as the sulfur
通过苯并三嗪酮的无金属脱氮环环化,开发了苯并[ c ][1,2]二硫醇-3-酮的便捷合成方法,这是酸介导苯并三嗪酮杂环化的第一个例子。这种新发现的苯并三嗪酮的反应活性使得通过使用硫化钠作为硫源在简单的反应条件下能够以良好的产率简化合成各种苯并[ c ][1,2]二硫醇-3-酮。
Synthesis of Benzo[e][1,3]thiazin‐4‐ones via PPh<sub>3</sub>‐Promoted Cyclization of Benzo[c][1,2]dithiol‐3‐ones and Amidines
A metal‐free cyclization of benzo[c][1,2]dithiol‐3‐ones and amidines is demonstrated herein. Triphenylphosphine was harnessed as the activating reagent to facilitate the ring‐opening of benzo[c][1,2]dithiol‐3‐ones via S‐S bond cleavage. This PPh3‐Promoted cyclization reaction of benzo[c][1,2]dithiol‐3‐ones enabled to forge a diverse array of 1,3‐benzothiazones in good yields with wide substrate scope