The invention is directed to a process for the preparation of a cyclic carbamate starting with a chiral propargylic alcohol and/or a suitable salt thereof, which is reacted with a cyclization agent selected from phosgene, diphosgene, triphosgene and mixtures thereof, and in that the reaction is carried out in the presence of an aqueous base, and a water-immiscible organic solvent, said organic solvent mainly comprising at least one compound selected from C2-5-alkyl C2-5-carboxylates and mixtures of at least one C2-5-alkyl C2-5-carboxylate with at least one C5-8-alkane. Another aspect of the invention is directed to a process for the synthesis of said cyclic carbamate starting described above, wherein also a process for the preparation of the chiral propargylic alcohol is provided.
本发明涉及一种从手性
丙炔醇和/或其适当盐开始制备环状
氨基甲酸酯的方法,所述方法包括将所述
丙炔醇和/或其适当盐与选择自
光气、二
光气、
三光气及其混合物的环化试剂反应,并在
水性碱和
水不相溶的有机溶剂的存在下进行反应,所述有机溶剂主要包括至少一种选择自C2-5烷基C2-5
羧酸酯和至少一种C5-8
烷烃的混合物中的化合物。本发明的另一个方面涉及一种从上述所述的手性
丙炔醇开始合成所述环状
氨基甲酸酯的方法,其中还提供了一种制备所述手性
丙炔醇的方法。