One-Pot Synthesis of 2-<i>R</i>-Naphtho[2,3-<i>b</i>]thiophene-4,9-diones via Cyclization of 2-(<i>R</i>-Ethynyl)-1,4-naphthoquinones with Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub>
作者:Denis S. Baranov、Alexander A. Popov、Danil A. Nevostruev、Alexey A. Dmitriev、Yurii V. Gatilov、Elena S. Kobeleva
DOI:10.1021/acs.joc.1c00852
日期:2021.9.3
The concise and efficient one-pot synthesis of 2-R-naphtho[2,3-b]thiophene-4,9-diones from 2-bromo-1,4-naphthoquinone and alkynes has been developed. The reaction proceeds through the formation of 2-(R-ethynyl)-1,4-naphthoquinones, which undergo transformation with Na2S2O3 to 2-R-naphtho[2,3-b]thiophene-4,9-diones via C–H sulfuration, accompanied by the formation of the aromatic Bunte salt, followed
已经开发了从 2-溴-1,4-萘醌和炔烃中简明高效地一锅法合成 2- R-萘并[2,3 - b ]噻吩-4,9-二酮的方法。该反应通过形成 2-( R -乙炔基)-1,4-萘醌,其与 Na 2 S 2 O 3转化为 2- R -萘并[2,3- b ]噻吩-4,9-二酮通过 C-H 硫化,伴随着芳香族 Bunte 盐的形成,然后是空气氧化和 5-endo-dig 环化。该协议的特点是简单、对官能团具有良好的耐受性、相对温和的条件和市售的起始化合物。