Facile Synthesis of 3-Alkyl-5-methyloxazolidine-2,4-diones and N-Lactoyl-N,N′-dialkylureas
摘要:
[image omitted] The reaction between aliphatic amines and propylene carbonate can be performed in solventless conditions under microwave irradiation, becoming nearly complete within 15min of irradiation. Oxidation of the formed mixture of 2-hydroxyethylcarbamates gives 3,5-methylalkyl-oxazolidine-2,4-diones. These compounds can react further with aliphatic primary amines to give N-lactoylureas.
3-Benzyl-5-methyl-1,3-oxazolidine-3,4-diones react with Grignard reactants and with lithium alkyls to yield 4-substituted 3-benzyl-4-hydroxy-5-methyl-1,3-oxazolidine-2-ones. The reaction is stereoselective and follows Cram's rule.