A versatile synthesis of fully aromatic benzo[c]phenanthridine alkaloids
作者:Graham R. Geen、Inderjit S. Mann、M. Valerie Mullane、Alexander McKillop
DOI:10.1016/s0040-4020(98)00540-7
日期:1998.8
A versatile new approach for the synthesis of benzo[c]phenanthridinealkaloids is described and is illustrated by the preparation of eight different alkaloids. The key steps are Smiles rearrangements, which allow easy access to 2-bromo-1-naphthylamines from 2-bromo-1-naphthols, and the attachment of the D-ring unit by Suzuki coupling.
描述了一种合成苯并[ c ]菲啶生物碱的通用新方法,并通过制备八种不同的生物碱加以说明。关键步骤是Smiles重排,可以轻松地从2-溴-1-萘酚中获得2-溴-1-萘胺,以及通过Suzuki偶联器连接D环单元。
A versatile synthesis of benzo[c]phenanthridine alkaloids
作者:Graham R. Geen、Inderjit S. Mann、M. Valerie Mullane、Alexander McKillop
DOI:10.1039/p19960001647
日期:——
Suzuki coupling between 2-bromo-1-formamidonaphthalenes and arylboronic acids is the key step in a versatile synthesis of benzo[c]phenanthridinealkaloids, illustrated by the synthesis of norallonitidine, nornitidine, noravicine, allonitidine, nitidine and avicine.
2-溴-1-甲酰胺基萘与芳基硼酸之间的Suzuki偶联是苯并[ c ]菲啶生物碱多功能合成中的关键步骤,其合成方法有降萘乙啶,降硝啶,降鸟碱,去甲丙啶,亚硝胺和阿维辛。
Rapid and Convergent Assembly of Natural Benzo[c]phenanthridines by Palladium/Norbornene Catalysis
construction of cyclic scaffolds is based on the use of reagents possessing a suitably tethered (masked) nucleophile which could terminate the catalytic cycle by reacting with an electrophilic organopalladium(II) intermediate. In this context, the association of a palladium salt with norbornene delivers a remarkable catalytic system that allows the multiple functionalization of an aryl halide in one pot. After
描述了一小部分天然苯并[c]菲啶的直接全合成。通过钯/降冰片烯联合催化和顺序转移氢化,三氟甲磺酸芳基酯与溴苄胺的选择性偶联将这些生物碱一锅法输送。最初形成的二氢菲啶可以顺利脱氢,而降冰片烯既可以作为它们组装的催化剂,也可以作为它们脱氢过程中的牺牲烯烃。钯催化是有机化学的有力工具,并且由于其多功能性而在合成中得到广泛应用。通过使用现成的底物,在过去的二十年中报道了许多选择性形成 C-C 和 C-杂原子键的方案。构建环状支架的一个强有力的策略是基于使用具有适当束缚(掩蔽)亲核试剂的试剂,该试剂可以通过与亲电子有机钯 (II) 中间体反应来终止催化循环。在这种情况下,钯盐与降冰片烯的结合提供了一个显着的催化体系,可以在一锅中对芳基卤化物进行多重官能化。在 Catellani 的开创性工作之后,报告了许多合成应用,它们采用这种策略提供了复杂的多环支架。在氮杂环的背景下,已经报道了提供咔唑、菲啶或二
Studies in SRN1 series. Part 14. Direct synthesis of benzo[c]phenanthridines and benzo[c]phenanthridones via SRN1 reactions