摘要 |
<p>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.</p> |
申请人 |
LONZA LTD;BRENNER, MEINRAD;CARREIRA, ERICK, M.;CHINKOV, NICKA;LORENZI, MIRIAM;WARM, ALEKSANDER;ZIMMERMANN, LOTHAR |
发明人 |
BRENNER, MEINRAD;CARREIRA, ERICK, M.;CHINKOV, NICKA;LORENZI, MIRIAM;WARM, ALEKSANDER;ZIMMERMANN, LOTHAR |