Highly Efficient Syntheses of Alkyl 3,3-Dialkoxypropanoates, Alkyl 4-Ethoxy-2-oxo-3-butenoates, and Monoprotected Malonaldehydes
作者:Lutz-F. Tietze、Heinrich Meier、Edgar Voß
DOI:10.1055/s-1988-27541
日期:——
Haloform reaction of 4-alkoxy-1,1,1-trichloro-3-buten-2-ones, which can be obtained by acylation of enol ethers, gives 3,3-dialkoxypropanoic esters. Transacetalization of ethyl 3,3-diethoxypropanoate with 2,2-dimethyl-1,3-propanediol, followed by reduction and oxidation with DMSO/oxalyl chloride yields a monoprotected malonaldehyde. 4-Ethoxy-2-oxo-3-butenoates are synthesized either by acylation of enol ethers with alkoxalyl chlorides or by Claisen condensation of alkyl pyruvates with orthoesters.
Synthesis of 2,3-dihydropyrazolo[5,1-<i>b</i>]thiazoles<i>via</i>a tandem condensation sulfur-extrusion reaction
作者:Wolfgang Hanefeld、Martin Schlitzer
DOI:10.1002/jhet.5570310675
日期:1994.11
2,3-Dihydropyrazolo[5,1-b]thiazoles 3 are the first representatives of a heterocyclic system, which are conveniently prepared by heating 3-aminorhodanines 1 with ethyl 2-bromo-3,3-diethoxypropionate (2), via a tandem condensation-sulfur extrusion reaction.
2,3-二氢吡[5,1- b ]噻唑类3是杂环系统的第一代表,其可方便地通过加热制备的3- aminorhodanines 1与2-溴-3,3- diethoxypropionate(2),经由一串联缩合-硫挤出反应。
NOVEL JNK INHIBITORS
申请人:Reddy Panduranga Adulla P.
公开号:US20100298314A1
公开(公告)日:2010-11-25
Disclosed are substituted imidazo[1,2-a]pyridines, imidazo[1,2-a]pyrazines, imidazo[1,2-c]pyrimidines and imidazo[1,2-d]triazines compounds of the formula: (1.0) Also disclosed are methods for treating JNK1 and ERK mediated diseases using the compounds of formula 1.0.
5-carbonyl-4-hydroxybenzofurans via a phenol-directed intramolecular Friedel–Crafts reaction. This synthetic method was applied for the total synthesis of furanoflavones. Experimental studies and density functional theory calculations suggest that hydrogen bond interactions between the phenolic hydroxy group and the scandium complex realize regioselective intramolecular cyclization.