Synthesis of N–H-Free 1,4-Dihydroisoquinoline-3(2<i>H</i>)-ones via Pd-Catalyzed C–H Olefination Using Polyfluorosulfinyl as the Auxiliary Group
作者:Yu-Hao Chen、Nan-Qi Shao、Chen Li、Dong-Hui Wang
DOI:10.1021/acs.orglett.0c01979
日期:2020.8.7
Pd(II)-catalyzed olefination of aryl C–H bonds with a self-cleaving 2-chlorotretafluoroethylsulfinyl (−SOCF2CF2Cl) auxiliary was developed. In the reaction mixture, the olefination products underwent in situ Michael addition and the subsequent expulsion of the auxiliary to provide the N–H-free 1,4-dihydroisoquinoline-3(2H)-one products. Mechanistic studies reveal that the auxiliary group is crucial for C–H activation
开发了具有自裂解2-氯四氟乙基亚磺酰基(-SOCF 2 CF 2 Cl)助剂的Pd(II)催化的芳基CH键的烯化。在反应混合物中,将烯烃化产物进行原位迈克尔加成反应,随后将助剂逐出,以提供不含NH的1,4-二氢异喹啉-3(2 H)-一产物。机理研究表明,辅助基团对于C–H活化至关重要,并且Na 2 CO 3和一种醇溶剂在促进多氟烷基亚磺酰基辅助剂的裂解中起关键作用。