Volume 54, Issue 41 pp. 12116-12120
Communication

Hydrophosphination of CO2 and Subsequent Formate Transfer in the 1,3,2-Diazaphospholene-Catalyzed N-Formylation of Amines

Che Chang Chong

Che Chang Chong

Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Link 21, Singapore 637371 (Singapore)

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Prof. Dr. Rei Kinjo

Corresponding Author

Prof. Dr. Rei Kinjo

Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Link 21, Singapore 637371 (Singapore)

Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Link 21, Singapore 637371 (Singapore)Search for more papers by this author
First published: 14 August 2015
Citations: 173

Graphical Abstract

Formate formation: Hydrophosphination of CO2 with 2-H-1,3,2-diazaphospholene afforded phosphorus formate, from which transfer of the formate to Ph2SiH2 produced Ph2Si(OCHO)2. These elementary reactions were applied to the metal-free catalytic N-formylation of various amine derivatives with CO2 in a one-pot approach at room temperature.

Abstract

Hydrophosphination of CO2 with 1,3,2-Diazaphospholene (NHP-H; 1) afforded phosphorus formate (NHP-OCOH; 2) through the formation of a bond between the electrophilic phosphorus atom in 1 and the oxygen atom from CO2, along with hydride transfer to the carbon atom of CO2. Transfer of the formate from 2 to Ph2SiH2 produced Ph2Si(OCHO)2 (3) in a reaction that could be carried out in a catalytic manner by using 5 mol % of 1. These elementary reactions were applied to the metal-free catalytic N-formylation of amine derivatives with CO2 in one pot under ambient conditions.

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