Radical dearomatization of benzene leading to phenanthridine and phenanthridinone derivatives related to (±)-pancratistatin
摘要:
The synthesis of the phenanthridinone nucleus common to the Amaryllidaceae series of natural products is achieved by a sequence involving tributylstannane-mediated, benzeneselenol-catalyzed addition of ortho-nitrogen functionalized aryl radicals to benzene, yielding aryl-substituted cyclohexadienes. These cyclohexadienes may be manipulated by oxidative ring closure sequences to generate functionalized phenanthridines. Beginning from 2-hydroxy-6-iodopiperonic acid a key intermediate in the Danishefsky synthesis of (+/-)-pancratistatin is achieved in two steps. (c) 2006 Elsevier Ltd. All rights reserved.
Radical dearomatization of benzene leading to phenanthridine and phenanthridinone derivatives related to (±)-pancratistatin
摘要:
The synthesis of the phenanthridinone nucleus common to the Amaryllidaceae series of natural products is achieved by a sequence involving tributylstannane-mediated, benzeneselenol-catalyzed addition of ortho-nitrogen functionalized aryl radicals to benzene, yielding aryl-substituted cyclohexadienes. These cyclohexadienes may be manipulated by oxidative ring closure sequences to generate functionalized phenanthridines. Beginning from 2-hydroxy-6-iodopiperonic acid a key intermediate in the Danishefsky synthesis of (+/-)-pancratistatin is achieved in two steps. (c) 2006 Elsevier Ltd. All rights reserved.
Radical dearomatization of benzene leading to phenanthridine and phenanthridinone derivatives related to (±)-pancratistatin
作者:David Crich、Venkataramanan Krishnamurthy
DOI:10.1016/j.tet.2006.04.096
日期:2006.7
The synthesis of the phenanthridinone nucleus common to the Amaryllidaceae series of natural products is achieved by a sequence involving tributylstannane-mediated, benzeneselenol-catalyzed addition of ortho-nitrogen functionalized aryl radicals to benzene, yielding aryl-substituted cyclohexadienes. These cyclohexadienes may be manipulated by oxidative ring closure sequences to generate functionalized phenanthridines. Beginning from 2-hydroxy-6-iodopiperonic acid a key intermediate in the Danishefsky synthesis of (+/-)-pancratistatin is achieved in two steps. (c) 2006 Elsevier Ltd. All rights reserved.