[EN] PROCESS FOR THE PREPARATION OF DIOXANE ACETIC ACID ESTERS<br/>[FR] PROCEDE DE PREPARATION D'ESTERS D'ACIDE ACETIQUE DE DIOXANE
申请人:DSM IP ASSESTS BV
公开号:WO2003106447A1
公开(公告)日:2003-12-24
Process for the preparation of an ester of formula (1), wherein R1represents
a leaving group, CN, OH or a COOR5 group, R3 and R4each
independently represent a 1-3 C alkyl group, and R2 and R5
each independently represent an ester residue, wherein the corresponding salt
with formula (2), wherein M represents H or an alkali (earth) metal in an inert
solvent is contacted with an acid chloride forming agent to form the corresponding
acid chloride, and the acid chloride is contacted with an alcohol with formula
R2OH in the presence of N-methyl-morpholine. Preferably M represents
an alkali metal, and R2 represents an alkyl group, particularly a t.-butyl
group. (1), (2)
制备式(1)酯的过程,其中R1代表一个离去基团,CN,OH或COOR5基团,R3和R4各自独立代表1-3 C的烷基基团,R2和R5各自独立代表酯残基,其中与式(2)对应的盐,其中M代表H或惰性溶剂中的碱(土)金属,与酸氯化剂接触以形成相应的酸氯化物,然后与醇R2OH在N-甲基吗啉存在下接触。优选M代表碱金属,R2代表烷基基团,特别是叔丁基团。 (1),(2)