Photocatalytic Hydroaminoalkylation of Styrenes with Unprotected Primary Alkylamines.
Photocatalytic Hydroaminoalkylation of Styrenes with Unprotected Primary Alkylamines.
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具有未受保护的原代烷基胺的苯乙烯的光催化氢氨基烷基化。
DOI:
10.1021/jacs.1c07401
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发表时间:
2021-10-06
影响因子:
15
通讯作者:
Cresswell AJ
中科院分区:
文献类型:
--
作者:
Askey HE;Grayson JD;Tibbetts JD;Turner-Dore JC;Holmes JM;Kociok-Kohn G;Wrigley GL;Cresswell AJ
Catalytic, intermolecular hydroaminoalkylation (HAA) of styrenes provides a powerful disconnection for pharmacologically relevant γ-arylamines, but current methods cannot utilize unprotected primary alkylamines as feedstocks. Metal-catalyzed HAA protocols are also highly sensitive to α-substitution on the amine partner, and no catalytic solutions exist for α-tertiary γ-arylamine synthesis via this approach. We report a solution to these problems using organophotoredox catalysis, enabling a direct, modular, and sustainable preparation of α-(di)substituted γ-arylamines, including challenging electron-neutral and moderately electron-rich aryl groups. A broad range of functionalities are tolerated, and the reactions can be run on multigram scale in continuous flow. The method is applied to a concise, protecting-group-free synthesis of the blockbuster drug Fingolimod, as well as a phosphonate mimic of its in vivo active form (by iterative α-C–H functionalization of ethanolamine). The reaction can also be sequenced with an intramolecular N-arylation to provide a general and modular access to valuable (spirocyclic) 1,2,3,4-tetrahydroquinolines and 1,2,3,4-tetrahydronaphthyridines. Mechanistic and kinetic studies support an irreversible hydrogen atom transfer activation of the alkylamine by the azidyl radical and some contribution from a radical chain. The reaction is photon-limited and exhibits a zero-order dependence on amine, azide, and photocatalyst, with a first-order dependence on styrene.
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影响因子:
9.8
作者:
Ji, Xiaochen;Liu, Qiong;Huang, Huawen
通讯作者:
Huang, Huawen
影响因子:
16.6
作者:
Bures, Jordi
通讯作者:
Bures, Jordi
影响因子:
6.6
作者:
Bortolamei, Nicola;Isse, Abdirisak A.;Gennaro, Armando
通讯作者:
Gennaro, Armando
影响因子:
16.6
作者:
Bielefeld, Jens;Doye, Sven
通讯作者:
Doye, Sven
DOI:
10.1002/anie.201703743
发表时间:
2018-01-02
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
作者:
Chu JCK;Rovis T
通讯作者:
Rovis T