Process for preparing 1,3-disubstituted urea of the formula:
wherein R5 is the same as or different from R6, and each of R5 and R6 is independently linear or branched, alkyl of 1-20 carbon atoms, alkenyl group having 2 to 20 carbon atoms or alkynyl group having 2 to 20 carbon atoms, which may have phenoxy, alkoxy of 1-13 carbon atoms, monocycloalkyl of 3-8 carbon atoms, bicycloalkyl of 6-12 carbon atoms, aryl of 6-13 carbon atoms, furyl, pyridyl, or aralkyl of 7-20 carbon atoms, comprising reacting cyclic carbonic acid ester with an amine using alkali metal alkoxide or trialkylamine as base, in safety and high yield.
制备式 1,3-二取代
脲的工艺:
其中 R5 与 R6 相同或不同,R5 和 R6 各自独立地为 1-20 个碳原子的直链或支链烷基、具有 2-20 个碳原子的烯基或具有 2-20 个碳原子的炔基,它们可以具有苯氧基、1-13 个碳原子的烷氧基、3-8 个碳原子的单环烷基、6-12 个碳原子的双环烷基、6-13 个碳原子的芳基、3-8 个碳原子的单环烷基、6-12 个碳原子的双环烷基、6-13 个碳原子的芳基、7-20 个碳原子的
呋喃基、
吡啶基或芳烷基,包括以碱金属氧化物或
三烷基胺为碱,使环状
碳酸酯与胺反应,安全且收率高。