[EN] METAL-CATALYZED ALKOXYCARBONYLATION OF A LACTONE<br/>[FR] ALCOXYCARBONYLATION CATALYSÉE PAR UN MÉTAL D'UNE LACTONE
申请人:QATAR FOUND EDUCATION SCIENCE & COMMUNITY DEV
公开号:WO2018175332A1
公开(公告)日:2018-09-27
The metal-catalyzed alkoxycarbonylation of a lactone is a method of alkoxycarbonylating a δ-lactone, specifically 3-ethylidene-6-vinyltetrahydro-2H-pyran-2-one. The method includes combining the δ-lactone with an alcohol in an organic solvent in the presence of a catalyst system that includes palladium or a salt thereof to form a reaction mixture, which is heated to 110-130˚C at a pressure of 20-50 bar for between 3-5 hours under flow of carbon monoxide gas. The product of the reaction is a substituted 2-octendioate diester. The alcohol may be methyl alcohol, n-butyl alcohol, 2-ethylhexanol, isobutyl alcohol, isopropyl alcohol, benzyl alcohol, or phenol. The solvent may be toluene, acetonitrile, or tetrahydrofuran. The method may include adding an acid to the reaction mixture, which may be dilute (about 5 mol%) sulfuric or p-toluenesulfonic acid. The catalyst system may also include a phosphine ligand.
δ-内酯的金属催化羟羰化是一种羟羰基化δ-内酯的方法,具体是3-乙烯基-6-乙烯基四氢-2H-吡喃-2-酮。该方法包括将δ-内酯与醇在有机溶剂中与包括钯或其盐的催化剂体系一起混合,形成反应混合物,然后在20-50巴的压力下,在110-130°C下在流动一氧化碳气体的条件下进行3-5小时的加热。反应的产物是取代的2-辛二酸二酯。醇可以是甲醇、正丁醇、2-乙基己醇、异丁醇、异丙醇、苄醇或酚。溶剂可以是甲苯、乙腈或四氢呋喃。该方法可能包括向反应混合物中添加酸,该酸可以是稀释的(约5摩尔%)硫酸或对甲苯磺酸。催化剂体系还可能包括膦配体。