[EN] PROCESS FOR THE SYNTHESIS OF CYCLIC CARBAMATES<br/>[FR] PROCÉDÉ DE SYNTHÈSE DE CARBAMATES CYCLIQUES
申请人:LONZA AG
公开号:WO2012048884A1
公开(公告)日:2012-04-19
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.
PROCESS FOR THE SYNTHESIS OF CHIRAL PROPARGYLIC ALCOHOLS
申请人:Brenner Meinrad
公开号:US20130324763A1
公开(公告)日:2013-12-05
A process for the synthesis of chiral propargylic alcohols.
合成手性丙炔基醇的过程。
PROCESS FOR THE SYNTHESIS OF CYCLIC CARBAMATES
申请人:Brenner Meinrad
公开号:US20130211077A1
公开(公告)日:2013-08-15
The invention is directed to a process for the preparation of a cyclic carbamate starting with o-aminobenzyl 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 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 C
2-5
-alkyl C
2-5
-carboxylates and mixtures of at least one C
2-5
-alkyl C
2-5
-carboxylate with at least one C
5-8
-alkane.