Efficient Synthesis of γ‐Keto Esters from Enamines and EDA
作者:Dan Huang、Ming Yan、Wei‐Jie Zhao、Qi Shen
DOI:10.1081/scc-200050387
日期:2005.3.1
Abstract The reaction of enamines with ethyldiazoacetate (EDA) catalyzed by dirhodium and copper complexes provided γ‐keto esters in good yields. The influences of catalyst, reaction solvent, temperature, and structure of enamines on this transformation were investigated.
New reaction of enamines with aryldiazoacetates catalyzed by transition metal complexes
作者:Wei-Jie Zhao、Ming Yan、Dan Huang、Shun-Jun Ji
DOI:10.1016/j.tet.2005.03.093
日期:2005.6
The reaction of aryldiazoacetates with enamines catalyzed by copper and rhodium complexes provided γ-keto esters in good yields. A full investigation of the effects of solvents, catalysts, enamines and aryldiazoacetates on the reaction was carried out. Careful analysis of the crude reaction mixture revealed a substituted enamine as the primary product, which was hydrolyzed over silica gel to give a
Synthesis and hydrogenation of (E)-γ-aryl-γ-morpholino-α-trifluoromethylated allyl alcohols through the reaction of trifluoroacetaldehyde ethyl hemiacetal with enamines
Treatment of trifluoroacetaldehyde ethylhemiacetal with enamines, derived from acetophenone derivatives, at room temperature gave (E)-1,1,1-trifluoro-4-morpholino-4-aryl-but-3-en-2-ols, which are intermediates for preparation of the β-trifluoromethylated aldol products, 4,4,4-trifluoro-3-hydroxy-1-aryl-butan-1-ones. The structure of the intermediate (E)-1,1,1-trifluoro-4-morpholino-4-(4-nitrophenyl)-but-3-en-2-ols
在室温下,用苯乙酮衍生物衍生的烯胺处理三氟乙醛乙基半缩醛,得到中间体的(E)-1,1,1,1-三氟-4-吗啉代-4-芳基-丁-3-烯-2-醇用于制备β-三氟甲基化的羟醛产物,4,4,4-三氟-3-羟基-1-芳基-丁丹-1-酮。中间体(E)-1,1,1-三氟-4-吗啉代-4-(4-硝基苯基)-丁-3-烯-2-醇的结构可以通过1 H,13 C NMR,IR鉴定和X射线晶体学。此外,中间体(E)-1,1,1,1-三氟-4-吗啉代-4-芳基-丁-3-烯-2-醇与氢在催化量(10 mol%)的钯/碳在三氟乙醇中的存在下于110℃平稳进行在室温下以良好至优异的产率得到1,1,1-三氟-4-芳基-2-丁醇。
Facile Synthesis of Sulfonyl Amidines and β-Amino Sulfonyl Enamines under Transition-Metal-Free Conditions
作者:Baohua Chen、Tingting Gao、Mingming Zhao、Xu Meng、Chuanbin Li
DOI:10.1055/s-0030-1260548
日期:2011.6
Treatment of enamine and azide resulted in the formation of either sulfonyl amidine or β-amino sulfonyl enamine derivative in moderate to good yields. The reaction could proceed under catalyst-free conditions.
Enamine-assisted facile generation of trifluoroacetaldehyde from trifluoroacetaldehyde ethyl hemiacetal and its carbon–carbon bond forming reaction leading to β-hydroxy-β-trifluoromethyl ketones
Trifluoroacetaldehyde ethyl hemiacetal 1 readily reacts with various enamines 2 in hexane at room temperature for 1 h to give the corresponding β-hydroxy-β-trifluoromethyl ketones in good yields.