申请人:Lonza Ltd
公开号:EP2447255A1
公开(公告)日:2012-05-02
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 cyclisation 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.
该发明涉及一种以手性丙炔醇和/或其适当盐为起始物,与从光气、二光气、三光气和它们的混合物中选择的环化试剂反应,且在水性碱和水不相溶的有机溶剂存在下进行反应的制备环氧羰基化合物的方法,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-烷烃的混合物的化合物。该发明的另一个方面涉及一种合成上述环氧羰基化合物的方法,其中还提供了一种制备手性丙炔醇的方法。