Enantioselective acylation of enolates; the reaction of (4R)-trans-diethyl 2-alkyl-2-methoxy-1,3-dioxolane-4,5-dicarboxylates with E- and Z-silyl enol ethers
Acylselenenyl halides 2(X = Cl, Br) have been generated from RC(O)SeAsPh21 and N-halogenosuccinimide, and the chlorides 2(X = Cl) have been treated with enol silyl ethers to give Se-β-oxoalkyl Selenoesters 5 in good yields.
Regioselective synthesis of 4-(2-oxoalkyl)pyridines via 1,4-dihydro-pyridine derivatives using silyl enol ethers and pyridinium salts
作者:Kin-ya Akiba、Yoshihiro Nishihara、Makoto Wada
DOI:10.1016/s0040-4039(00)88414-2
日期:——
– 87% yields. When 2, 2, 2-trichloroethyl chloroformate was employed, yields of the corresponding 1,4-dihydropyridines (0 were higher (80 – 100% yields). and were oxidized by oxygen or AgNO3 to give 4-(2-oxoalkyl)pyridines ( : 30 –65%).
Electrochemical, Iodine-Mediated α-CH Amination of Ketones by Umpolung of Silyl Enol Ethers
作者:Julia Strehl、Gerhard Hilt
DOI:10.1021/acs.orglett.0c02068
日期:2020.8.7
oxidative Umpolung reaction of silyl enol ethers utilizing simple iodide salts for the synthesis of α-amino ketones is described. The products were isolated in excellent yields of up to 100%, and various functionalized starting materials were accepted in an undivided electrochemical cell design. Moreover, a sensitivity assessment to ensure an improved reproducibility of the reaction and cyclic voltammetry
β‐Diazocarbonyl Compounds: Synthesis and their Rh(II)‐Catalyzed 1,3 C−H Insertions
作者:Liyin Jiang、Zhaofeng Wang、Melanie Armstrong、Marcos G. Suero
DOI:10.1002/anie.202015077
日期:2021.3.8
of ketone silyl enol ethers with diazomethyl‐substituted hypervalent iodine reagents that gives access to unusual β‐diazocarbonyl compounds. The potential of this unexplored class of diazo compounds for the development of new reactions was demonstrated by the discovery of a rare Rh‐catalyzed intramolecular 1,3 C−H carbene insertion that led to complex cyclopropanes with excellent stereocontrol.
REACTION OF TRIMETHYLSILYL ENOL ETHERS WITH ISOQUINOLINIUM SALTS. A FACILE SYNTHESIS OF ETHYL 1-(2-OXOALKYL)-1,2-DIHYDROISOQUINOLINE-2-CARBOXYLATES AND THEIR CYCLIZATION
作者:Makoto Wada、Masayuki Nakatani、Kin-ya Akiba
DOI:10.1246/cl.1983.39
日期:1983.1.5
An efficient method is described for the synthesis of ethyl 1-(2-oxoalkyl)-1,2-dihydroisoquinoline-2-carboxylates by C–C bond formation between 2-ethoxycarbonylisoquinolinium chloride and trimethylsilylenolethers. The products were treated with a few bases to afford the corresponding pyrido [2,1-a] isoquinoline derivatives.