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Efficient Co‐Catalyzed Double Hydroboration of Nitriles: Application to One‐Pot Conversion of Nitriles to Aldimines
Author(s) -
Gudun Kristina A.,
Slamova Ainur,
Hayrapetyan Davit,
Khalimon Andrey Y.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202000753
Subject(s) - aldimine , chemistry , hydroboration , aldehyde , organic chemistry , catalysis , nitro , alkene , nitrile , combinatorial chemistry , alkyl
The commercially available and bench‐stable Co(acac) 2 /dpephos system is employed as a precatalyst for selective and efficient room temperature hydroboration of organic nitriles with HBPin to produce a series of N,N‐diborylamines [RN(BPin) 2 ], which react in situ with aldehydes to give aldimines. Formation of aldimines from N,N‐diborylamines does not require a dehydrating agent, is applicable to a wide range of N,N‐diborylamine and aldehyde substrates and is highly chemoselective, being unaffected by various common functional groups, such as alkenes, alkynes, secondary amines, ketones, esters, amides, carboxylic acids, pyridines, nitriles, and nitro compounds. The overall transformation represents a synthetically valuable approach to aldimines from nitriles and can be performed in a sequential one‐pot manner, tolerating ester, lactone, carboxamide and unactivated alkene functionalities.