N-fluorobis[(trifluoromethyl)sulfonyl]imide: an efficient reagent for the .alpha.-fluorination of functionalized carbonyl compounds
摘要:
The N-fluorobis[(trifluoromethyl)sulfonyl]imide (1) has been used in the electrophilic fluorination of the lithium enolate of esters, amides, and ketones. The corresponding alpha-fluorocarbonyl compounds have been obtained in good yields. The alpha-fluorination of beta-diesters, beta-diamides, beta-keto esters, and beta-diketones has been performed either on the neutral compounds or on the metal enolates. In this way some geminal azafluoro, chlorofluoro, fluorooxy compounds have been prepared in nearly quantitative yields. Also some alpha-keto esters and acids have been selectively monofluorinated in the beta-position by simple treatment of the neutral compound with 1.
Biocatalytic Asymmetric Construction of Secondary and Tertiary Fluorides from β‐Fluoro‐α‐Ketoacids**
作者:Jason Fang、Laura E. Turner、Michelle C. Y. Chang
DOI:10.1002/anie.202201602
日期:2022.5.16
Biocatalytic asymmetric synthesis of secondary and tertiary fluorides is performed by the pyruvate aldolase HpcH and its engineered variants, utilizing β-fluoro-α-ketoacids as non-native donor substrates. Rationalization of beneficial mutations and optimization of reaction conditions allowed for the chemoenzymatic preparation of fluorinated synthons with relevance to bioactive natural products and