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Ligand‐free Iron(II)‐Catalyzed N‐Alkylation of Hindered Secondary Arylamines with Non‐activated Secondary and Primary Alcohols via a Carbocationic Pathway
Author(s) -
Nayal Onkar S.,
Thakur Maheshwar S.,
Kumar Manoranjan,
Kumar Neeraj,
Maurya Sushil K.
Publication year - 2018
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201701183
Subject(s) - chemistry , primary (astronomy) , alkylation , amination , catalysis , carbocation , organic chemistry , hydroamination , amine gas treating , allylic rearrangement , combinatorial chemistry , physics , astronomy
Secondary benzylic alcohols represent a challenging class of substrates for N‐alkylation of amines. Herein, we describe an iron(II)‐catalyzed eco‐friendly protocol for N‐alkylation of secondary arylamines with secondary benzyl alcohols through a carbocationic pathway instead of the known borrowing hydrogen transfer (BHT) approach. Transiently generated carbocations, produced from alcohols via self‐condensation, were coupled with arylamines to provide highly functionalized amine products. The scope of this methodology involves N‐alkylation of primary, secondary and heterocyclic amines with primary/secondary benzylic, allylic and heterocyclic alcohols, which are common key structures in numerous pharmaceuticals drugs. The method can also be easily adopted for the amination of various natural products.