Synthesis of oxacalothrixin B and its analogues involving iodine/TBHP-mediated electrocyclization
作者:Bose Muthu Ramalingam、Arasambattu K. Mohanakrishnan
DOI:10.1016/j.tetlet.2017.06.036
日期:2017.7
carbazoloquinone alkaloid, calothrixin B was achieved from 2-acetyl-3-methylbenzofuran. An iodine/TBHP-mediated oxidative cyclization of benzofuranyl-enamine has been employed as a key step to synthesize, the crucial intermediate 1-hydroxy dibenzofurancarbaldehyde. The latter upon reductive cyclization followed by PIDA-mediated oxidation furnished oxacalothrixin B and its analogues.
从2-乙酰基-
3-甲基苯并呋喃中合成了
草酸扑热息痛(一种
生物学上重要的
咔唑醌
生物碱,等扑热
潮霉素B)的总合成物。
碘/
TBHP介导的
苯并呋喃基-烯胺的氧化环化已被用作合成关键中间体
1-羟基二苯并呋喃甲醛的关键步骤。后者在还原环化之后进行
PIDA介导的氧化,从而提供了草ac毒素B及其类似物。