The Use of Fluoride as a Leaving Group: SN2′ Displacement of a CF Bond on 3,3-Difluoropropenes with Organolithium Reagents To Give Direct Access to Monofluoroalkenes
Lithium is the key to activate the nucleofuge ability of fluoride in the title transformation (see scheme). This simple and straightforward approach not only provides a practical synthetic method for the preparation of monofluoroalkenes, an important fluorinated motif, but also demonstrates the ability of fluoride to act as a competent leaving group in nucleophilic substitution reactions.
An efficient and convenientsynthesis for mono-fluoroalkyl reagents α-halo-α-fluoroketones, including α-iodo-α-fluoroketones, α-bromo-α-fluoroketones and α-chloro-α-fluoroketones was reported by using the Wu–Colby's protocol involving the release of trifluoroacetate.
Photoinduced promiscuity of cyclohexanone monooxygenase for the enantioselective synthesis of α-deuterated carbonyl compounds
作者:Yongzhen Peng、Kongchen Xia、Qi Wu
DOI:10.1016/j.mcat.2023.113709
日期:2024.1
The direct asymmetric synthesis of deuterium compounds has gained increasing attention. Here we report the engineered cyclohexanone monooxygenase from Acinetobacter sp. NCIMB 9871 for the synthesis of chiral α-deuterated carbonylcompounds via enantioselective reductive dehalogenation. The engineered CHMO exhibited good chemoselectivity, stereoselectivity and d-incorporation (up to 92% yield, 98% e
Access to All-Carbon Quaternary Centers by Photocatalytic Fluoroalkylation of α-Halo Carbonyl Compounds
作者:Gang Liu、Haigen Shen、Zhaobin Wang
DOI:10.1021/acs.orglett.4c00041
日期:2024.3.8
agrochemical applications. In this study, we present a visible light-mediated photoredox neutral strategy for the fluoroalkylation of tertiary alkyl chlorides under transition-metal-free conditions. This method allows for the facile synthesis of fluoroalkylated all-carbon quaternary centers, exhibiting excellent functional group compatibility. Mechanistic studies reveal the involvement of two reactive