Kadikova RN, Ramazanov IR, Gabdullin AM, Mozgovoj OS, Dzhemilev UM. Niobium- and zirconium-catalyzed reactions of substituted 2 alkynylamines with Et
2Zn.
RSC Adv 2021;
11:4631-4638. [PMID:
35424400 PMCID:
PMC8694551 DOI:
10.1039/d0ra10132j]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/13/2021] [Indexed: 01/02/2023] Open
Abstract
The NbCl5-EtMgBr-catalyzed reaction of N,N-disubstituted 2-alkynylamines with Et2Zn followed by hydrolysis or deuterolysis affords (2Z)-alkenylamines (reduction products of alkyne) in high yields. The reaction of N,N-disubstituted 2-alkynylamines with Et2Zn catalyzed by the Cp2ZrCl2-EtMgBr system occurs as 2-zincoethylzincation, resulting, after deuterolysis or iodinolysis, in the regio- and stereoselective formation of the corresponding dideuterated and diiodinated 2-alkenylamine derivatives with a trisubstituted double bond. This study demonstrates the difference between the catalytic effects of NbCl5 and Cp2ZrCl2 on the pathway of reaction of tertiary 2-alkynylamines with Et2Zn in the presence of catalytic amounts of EtMgBr.
Collapse