A versatile approach to 1-oxo-, 1-oxo-3,4-dihydro- and 1,3,4-trioxo isoquinoline alkaloids and first total synthesis of the dimeric 1-oxoisoquinoline alkaloids berbanine and berbidine
作者:Ramona Schütz、Sandra Schmidt、Franz Bracher
DOI:10.1016/j.tet.2020.131150
日期:2020.5
unit of the isoquinoline core. TFA-mediated cyclization of crude ortho-ethoxyvinyl benzamides gave 1-oxoisoquinolines in one single operation. Further modifications of these compounds opened an access to the other chemotypes. In total, 14 alkaloids from four chemotypes (five 1-oxoisoquinolines, six 1-oxo-3,4-dihydroisoquinolines, one 1,3,4-trioxoisoquinoline, and two dimeric isoquinoline alkaloids)
我们已经从使用2-乙氧基乙烯基硼酸酯作为C 2构件引入异氰酸喹啉核心的C 2结构单元的现成的2-溴苯甲酰胺开始,制定了一种非常短的1-氧异喹啉生物碱方法。TFA介导的原邻环化-乙氧基乙烯基苯甲酰胺在一次操作中得到1-氧代异喹啉。这些化合物的进一步修饰打开了进入其他化学型的途径。在这项研究中,总共获得了来自四种化学型的十四种生物碱(五种1-氧代异喹啉,六种1-氧代-3,4-二氢异喹啉,一种1,3,4-三氧代异喹啉和两种二聚异喹啉生物碱)。通过这种方法,我们改进了单体氧代异喹啉的总合成,并计算出了二聚生物碱小ban碱和苯达比定的第一批总合成。