Reductive nitro-Mannich route for the synthesis of 1,2-diamine containing indolines and tetrahydroquinolines.

Reductive nitro-Mannich route for the synthesis of 1,2-diamine containing indolines and tetrahydroquinolines.
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用于合成含二氢吲哚和四氢喹啉的 1,2-二胺的还原硝基曼尼希路线。

DOI:
10.1021/jo3010827
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发表时间:
2012
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Anderson JC
Anderson JC
中科院分区:
--
文献类型:
--
作者:
Anderson JC

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A one-pot, 1,4-hydride addition nitro-Mannich reaction between a set of nitroalkenes3and a wide range ofN-p-methoxyphenyl-protected aldimines, derived from alkyl, aryl and heteroaryl aldehydes, followed by Zn/HCl reduction leads to stereochemically defined 1,2-diamines. These underwent palladium-catalyzed cyclization and depending upon the presence or not of the trifluoroacetamide protecting group gave either tetrahydroquinolines18or indolines14in high overall yield and diastereoselectivity (19 examples each). In each case, the more nucleophilic pendant amine cyclizes to give a benzofused saturated heterocyclic 5- or 6-membered ring, with an additional vicinal amino stereocenter in each.
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