Here we have successfully demonstrated the first stereodivergent direct nucleophilic trifluoromethylation of N-sulfinylimines using the potent greenhouse gas “HFC-23, fluoroform” with an organic-superbase or an organometallic-base in high yields and selectivity.
A micro‐flow nucleophilic trifluoromethylation of carbonyl compounds using gaseous fluoroform was developed. This method also allows the first micro‐flow transformation of N‐sulfinylimines into trifluoromethyl amines with excellent diastereoselectivity. To demonstrate the synthetic utility of this micro‐flow synthesis, the formal micro‐flow synthesis of Efavirenz is described.
Diastereoselective Addition of Organomagnesium and Organolithium Reagents to Chiral Trifluoromethyl<i>N</i>-<i>tert</i>-Butanesulfinyl Hemiaminals
作者:Fabienne Grellepois、Abdelkhalek Ben Jamaa、Abdoulaye Gassama
DOI:10.1002/ejoc.201300890
日期:2013.10
The asymmetricsynthesis of trifluoromethylated tertiary and secondary carbinamines (α,α-dibranched and α-branched amines) was achieved by reaction of alkyl, aryl and allyl organomagnesium or organolithium reagents to trifluoromethyl N-tert-butanesulfinyl hemiaminals, bench-stable analogs of the corresponding ketoimines.