B(C6F5)3: a robust catalyst for the activation of CO2 and dimethylamine borane for the N-formylation reactions

Vitthal B. Saptal, Gaurav Juneja, Bhalchandra M. Bhanage*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

In this work, B(C6F5)3 is utilized as an organocatalyst for the transition-metal-free N-formylation of amines using carbon dioxide (CO2) as a C1 source and dimethylamine borane (Me2NH·BH3) as a green hydrogen transfer source at 80 °C. Most reported works utilize silane and hydrogen for the N-formylation reactions using CO2 which have thus far been limited by low atom economy, high cost or the use of harsh reaction conditions. This catalytic protocol affords a broad range of formylated products in moderate to excellent yields under mild reaction conditions with a high TON and TOF. The bulky boron (B(C6F5)3) catalyst reacts with amines and forms a Frustrated Lewis Pair (FLP) and activates CO2 and Me2NH·BH3 molecules. Additionally, this boron catalyst shows high catalytic activity for the cyclization of o-phenylenediamines using CO2 and Me2NH·BH3 to synthesize benzimidazoles.

Original languageEnglish
Pages (from-to)15847-15851
Number of pages5
JournalNew Journal of Chemistry
Volume42
Issue number19
DOIs
StatePublished - 2018
Externally publishedYes

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