Regioselective Ring Expansion of Isatins with <i>In Situ</i> Generated α-Aryldiazomethanes: Direct Access to Viridicatin Alkaloids
作者:Yellaiah Tangella、Kesari Lakshmi Manasa、Namballa Hari Krishna、B. Sridhar、Ahmed Kamal、Bathini Nagendra Babu
DOI:10.1021/acs.orglett.8b01417
日期:2018.6.15
A novel efficient one-pot regioselective ring-expansion reaction of isatins with in situ generated α-aryl/heteroaryldiazomethanes for the construction of viridicatin alkaloids has been described under metal-free conditions. The utility of this protocol is further demonstrated in the synthesis of naturally occurring viridicatin, viridicatol, and substituted 3-O-methyl viridicatin and their scale up
在无金属条件下,已经描述了一种新型的靛红与原位生成的α-芳基/杂芳基重氮甲烷的有效的一锅区域选择性环扩环反应,用于构建ridicatin的生物碱。该协议的效用在天然存在的viridicatin,viridicatol和取代的3- O-甲基viridicatin的合成及其规模放大中得到了进一步证明。