Difluoromethyltrialkylammonium SaltsTheir Expeditious Synthesis from Chlorodifluoromethane and Tertiary Amines in the Presence of Concentrated Aqueous Sodium Hydroxide. The Catalytic Process
作者:Ewelina Nawrot、Andrzej Joñczyk
DOI:10.1021/jo701735n
日期:2007.12.1
[GRAPHICS]We found that difluorocarbene generated from chlorodifluoromethane with 50% aqueous sodium hydroxide reacts with lipophilic tertiary amines 1a-g giving difluoromethyltrialkylammonium chlorides 2a-g in high yields. Similarly, difluoromethyltrialkylammonium iodides 3h-l, nitrates 4h-k, or isothiocyanates 5i,j were synthesized from hydrophilic tertiary amines 1h-l and the corresponding sodium or potassium salts. The process is catalytic with respect to the base used.
Reintroducing Azidodifluoromethane: Synthesis, Stability and [3+2] Cycloadditions
Novel N‐difluoromethyl‐1,2,3‐triazoles were synthesized through Huisgen's azide–alkyne reaction and a ketone [3+2] cycloaddition by using azidodifluoromethane – a versatile N‐difluoromethyl building block obtained by a two‐step synthesis from chlorodifluoromethane via the quaternary trialkyldifluoromethylammonium salt.