Borrowing and Returning Oxygen Atom in Trifluoroacetic Anhydride Transfer to Nitrones: A Versatile Route for the Synthesis of <i>N</i>
-Trifluoroacetyl Amides
作者:Junwen Wang、Zhiqiang Weng
DOI:10.1002/ejoc.201801662
日期:2019.2.14
A variety of N‐trifluoroacetyl amides are obtained from trifluoroaceticanhydride transfers to nitrones through borrowing and returning oxygen atom. This transformation proceeds smoothly under mild conditions via electrophilic trifluoroacetylation, followed by nucleophilicaddition and elimination, and intramolecular substitution. Furthermore, the method also provides efficient access to N‐difluoroacetyl
2,2,2-Trifluoroacetaldehyde <i>O</i>-(Aryl)oxime: A Precursor of Trifluoroacetonitrile
作者:Bo Lin、Yunfei Yao、Yangjie Huang、Zhiqiang Weng
DOI:10.1021/acs.orglett.2c00637
日期:2022.3.18
The preparation of 2,2,2-trifluoroacetaldehyde O-(aryl)oxime, a previously inaccessible precursor of trifluoroacetonitrile, via reaction of hydroxylamine and trifluoroacetaldehyde hydrate is reported. This precursor released CF3CN in quantitative yield under mildly basic conditions. The precursor was successfully used in the synthesis of trifluoromethylated oxadiazoles. The facile, cost-effective,