Synthesis 2022; 54(11): 2687-2695
DOI: 10.1055/a-1736-8721
paper

Palladium-Catalyzed Semihydrogenation of Alkynes with EtOH: Highly Stereoselective Synthesis of E- and Z-Alkenes

Chengniu Wang
a   Medical School, Institute of Reproductive Medicine, Nantong University, Nantong 226001, Jiangsu, P. R. of China
,
Jin Dong
a   Medical School, Institute of Reproductive Medicine, Nantong University, Nantong 226001, Jiangsu, P. R. of China
,
Tingting Li
a   Medical School, Institute of Reproductive Medicine, Nantong University, Nantong 226001, Jiangsu, P. R. of China
,
Xi Zhao
a   Medical School, Institute of Reproductive Medicine, Nantong University, Nantong 226001, Jiangsu, P. R. of China
,
Dawei Xu
b   Department of Orthopaedics, Affiliated Hospital 2 of Nantong University, Nantong 226001, Jiangsu, P. R. of China
› Author Affiliations
This work was supported in part by grants from the National Natural Science Foundation of China (82001606 to C.N.W., 81901540 to X.Z.), ‘333 Project’ Scientific Research Project of Jiangsu Province (BRA2020204 to D.W.X.), and Key Medical Talents Financial Assistance of Nantong (to D.W.X.).


Abstract

A palladium-catalyzed semihydrogenation of alkynes to E- and Z-alkenes employing EtOH as the hydrogenating agent is reported. The selectivity of the reaction system was effectively controlled by ­ligand/additive and solvent regulation. The use of sodium acetate/­triethanolamine (NaOAc/TEOA), THF, and (1R,2R)-bis[(2-­methoxyphenyl)phenylphosphino]ethane [(R,R)-DIPAMP] in CH3CN was critical for the stereoselective semihydrogenation of alkynes. The general applicability of this procedure was highlighted by the synthesis of more than 36 alkenes, in good yields with high stereoselectivities.

Supporting Information



Publication History

Received: 15 November 2021

Accepted after revision: 11 January 2022

Accepted Manuscript online:
11 January 2022

Article published online:
14 March 2022

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