A novel CAN-SiO2-mediated one-pot oxidation of 1-keto-1,2,3,4-tetrahydrocarbazoles to carbazoloquinones: Efficient syntheses of murrayaquinone A and koeniginequinone A
作者:Suchandra Chakraborty、Gautam Chattopadhyay、Chandan Saha
DOI:10.1002/jhet.561
日期:2011.3
1‐keto‐1,2,3,4‐tetrahydrocarbazoles (1) to carbazole‐1,4‐quinones (2) are efficiently carried out by CAN‐SiO2‐mediated reaction. This generalized protocol was successfully extended to the synthesis of two naturally occurring carbazoloquinones: murrayaquinone A (2b) and koeniginequinone A (2g). A plausible mechanism for this novel reaction involves formation of a 9‐hydroxy‐2,3,4,9‐tetrahydro‐1H‐carbazole‐1‐one
通过CAN-SiO 2介导的反应可以有效地将取代的1-酮-1,2,3,4-四氢咔唑(1)一锅法氧化为咔唑-1,4-醌(2)。该通用方案已成功扩展到两种天然存在的咔唑醌的合成:murrayaquinone A(2b)和koeniginequinone A(2g)。这种新反应的可能机制涉及形成9-羟基-2,3,4,9-四氢-1 H-咔唑-1-酮,然后重排为1-羟基咔唑衍生物,这些衍生物会被铈进一步氧化(IV )到咔唑醌。J.杂环化学。(2011)。