Synthesis and Application of (3<i>R</i>,4<i>R</i>)-3,4-Bis(diphenylphosphino)tetrahydrofuran as Ligand for Asymmetric Hydrogenation of Acrylic Acids
作者:Andreas Terfort
DOI:10.1055/s-1992-26275
日期:——
A new, chiral bisphosphine, (3R,4R)-3, 4-bis(diphenylphosphino)tetrahydrofuran (4), is synthesized in three steps from (R,R)-tartaric acid esters. With rhodium(I) complexes of 4enantiomeric excesses of 54 to 97% are obtained on catalytic hydrogenation of 2-(acetylamino)acrylic acid, 2-(acetylamino)cinnamic acids and itaconic acid. The applied substrate/catalyst ratios were between 250: 1 and 11000:1.
Optically active N-acetylamino acid esters were obtained by enantioselective hydrolysis of their racemates using fermenting baker'syeast.
光学活性的N-乙酰基氨基酸酯是通过使用发酵酵母进行对映体的对映体水解而获得的。
PROCESS FOR THE PREPARATION OF AMINO ACID DERIVATIVES
申请人:Merschaert Alain
公开号:US20130190533A1
公开(公告)日:2013-07-25
The present invention relates to a process of manufacture of compounds of formula (B) wherein R
1
, R
2
and R
3
are as defined for compounds of formula (A), which process comprises hydrogenation of compounds of general formula (A). In particular, the present invention relates to an improved process for the manufacture of Lacosamide (LCM), (R)-2-acetamido-N-benzyl-3-methoxypropion-amide (B1), which is useful as an anticonvulsive drug.
PROCESS FOR PREPARATION OF LACOSAMIDE AND SOME N-BENZYL-PROPANAMIDE INTERMEDIATE DERIVATIVES
申请人:Rajadhyaksha Mangesh Narayan
公开号:US20130123522A1
公开(公告)日:2013-05-16
The present invention discloses novel process for the preparation of (2R)-2-acetamido-N-benzyl-3-methoxypropanamide of Formula I involving novel intermediates of Formula-XIX and Formula-XX.