摘要:
The invention relates to an industrially viable and advantageous process for the preparation of (2S,3R)-2-amino-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoic acid, having the following formula: generally known as Droxidopa, or of intermediates useful in the synthesis thereof.
摘要:
The invention relates to an industrially viable and advantageous process for the preparation of (2S,3R)-2-amino-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoic acid, having the following formula:
generally known as Droxidopa, or of intermediates useful in the synthesis thereof.
摘要:
The invention relates to the preparation of chiral compounds, in particular to the preparation of chiral compounds which may be used as intermediates for the preparation of anti-diabetic agents, preferably sitagliptin.
摘要:
The present invention provides a chiral phase-transfer catalyst of the following formula (I):
The compound (I) can be produced by reacting a 2,2'-dimethylene bromide-1,1'-biphenyl derivative, which can be produced through comparatively small number of steps, with an easily available secondary amine.
摘要:
1-Amino-2-vinylcyclopropanecarboxylic acid ester, which is useful as a synthetic intermediate of pharmaceuticals, can be prodced by a process of producing 1-amino-2-vinylcyclopropanecarboxylic acid ester represented by formula (4):
comprising a step of hydrolysis of an optically active 1-N-(arylmethylene)amino-2-vinylcyclopropanecarboxylic acid ester represented by formula (3):
which is obtained by reacting an N-(arylmethylene)glycine ester represented by formula (1):
with a compound represented by formula (2):
in the presence of a base and an optically active quaternary ammonium salt.