Photoredox-Catalyzed Decarboxylative Alkylation of Silyl Enol Ethers To Synthesize Functionalized Aryl Alkyl Ketones
作者:Weiguang Kong、Changjiang Yu、Hejun An、Qiuling Song
DOI:10.1021/acs.orglett.7b03587
日期:2018.1.19
Photoredox-catalyzed decarboxylative alkylation of silylenolethers has been developed. Diverse functionalized arylalkylketones were afforded in modest to good yields using N-(acyloxy)phthalimide as an easy access alkyl radical source under mild and operationally simple conditions. The excellent performance of drug molecules such as fenbufen and indomethacin and naturally occurring carboxylic acids
Enantioselective N-Heterocyclic Carbene Catalyzed Synthesis of Functionalized Indenes
作者:Changhe Zhang、David W. Lupton
DOI:10.1021/acs.orglett.7b01981
日期:2017.9.1
An enantioselective NHC (N-heterocycliccarbene) catalyzed synthesis of indenes from bifunctional α,β-unsaturated acyl fluorides and TMS enol ethers has been discovered. The reaction has broad generality (31 examples) and proceeds with high levels of enantioselectivity (most >92:8 er). Mechanistically the reaction likely occurs via a Michael/β-lactonization/decarboxylation sequence. Derivatization
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-Difluorinated Iodides with Silyl Enol Ethers Mediated by Photoredox Catalysis
作者:Grigory N. Chernov、Vitalij V. Levin、Vladimir A. Kokorekin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1002/adsc.201700423
日期:2017.9.4
A method for the synthesis of β,β‐difluorinated ketones by coupling of α,α‐difluorinated iodides with silyl enol ethers is described. The reaction is performed in the presence of iridium(III) photocatalysts under the irradiation with 400 nm light emitting diodes.
Triphosgene/Sodium Organosulfinate System: A General and Efficient Electrophilic Thiolation of Silylenol Ethers and Electron-Rich Heteroaromatics
作者:Yan-qin Yuan、Sheng-rong Guo、Hai-jun Gao、Yu-xin Gu、Zhe-fei Wang、Yan Wang
DOI:10.1055/s-0040-1707299
日期:2020.11
developed by using commercially available triphosgene as a reductant and the appropriate alkyl- or arylsulfinates, which were transformed in situ into electrophilic RSCl intermediates in the presence of triphosgene. This procedure represents a general and powerful approach for the synthesis of α-(trifluoromethyl)thio-substituted ketones and thiolated electron-rich heteroaromatic compounds.
Synthesis of β-Amino Ketones by Addition of Aryl Methyl Ketones to Sulfinimines: Application to the Total Synthesis of HPA-12, Norsedamine, and Sedamine
作者:Arava Amaranadha Reddy、Kavirayani R. Prasad
DOI:10.1021/acs.joc.7b02611
日期:2017.12.15
Synthesis of β-sulfinamido ketones was accomplished by the addition of silyl enol ethers derived from arylmethyl ketones to chiral sulfinimines in excellent yield and selectivity. Application of the formed β-amino substituted ketones is exemplified in the totalsynthesis of sphingolipid HPA-12 and the sedamine alkaloids.