Visible-Light Photocatalytic Preparation of 1,4-Ketoaldehydes and 1,4-Diketones from α-Bromoketones and Alkyl Enol Ethers
作者:William H. García-Santos、Jeferson B. Mateus-Ruiz、Alejandro Cordero-Vargas
DOI:10.1021/acs.orglett.9b01275
日期:2019.6.7
A Ru2+-photocatalyzed, visible-light-mediated ATRA reaction for the straightforward preparation of 1,4-ketoaldehydes, 1,4-diketones, and 1,4-ketoesters, which are of difficult access by other means, is reported herein. This method employs readily accessible α-bromoketones and alkyl vinyl ethers as starting materials, allowing the construction of secondary, tertiary, and challenging quaternary centers
SmI2-mediated reductive cleavage of α-hetero substituents of α-alkyl or α-aryl ketones and lactone gave the corresponding “thermodynamic samarium enolates”. Enantioselective protonation of the samarium enolates with C2-symmetric chiral diols afforded the corresponding ketones and lactone in moderate to high enantioselectivities.
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
Horii et al., Pharmaceutical Bulletin, 1957, vol. 5, p. 82
作者:Horii et al.
DOI:——
日期:——
Samarium diiodide-promoted electrophilic amination of ketone enolates: efficient synthesis of quaternary carbon-containing α-aminated ketones
作者:Xing-Wen Sun、Wei Wang、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1016/j.tetlet.2008.07.123
日期:2008.9
An efficient and practical electrophilic amination method that allows the preparation of useful quaternary carbon-containing alpha-aminoketones was developed. The reaction proceeds regiospecifically via a samarium enolate intermediate at room temperature in the presence of mild reducing agent SmI2. Unlike the most reported lithium enolate cases, this new amination method does not require the use of strong base such as BuLi or LDA. (C) 2008 Elsevier Ltd. All rights reserved.