Process for producing optically active 3-hydroxypropionic ester derivative
申请人:Taoka Naoaki
公开号:US20060166342A1
公开(公告)日:2006-07-27
The present invention is to provide a process for simply producing an optically active 3-hydroxypropionic ester derivative useful as a medicament intermediate from an inexpensive material. More specifically, the present invention is directed to a process for producing an optically active 3-hydroxypropionic ester derivative comprising reacting an acetic ester derivative available at low cost with abase and a formic ester, thereby converting the acetic ester derivative into a 2-formylacetic ester derivative, and thereafter, stereospecifically reducing the formyl group of the derivative by use of an enzymatic source capable of stereoselectively reducing the formyl group of the derivative.
PROCESS FOR PRODUCING OPTICALLY ACTIVE 3-HYDROXYPROPIONIC ESTER DERIVATIVE
申请人:TAOKA Naoaki
公开号:US20100016627A1
公开(公告)日:2010-01-21
A 2-formylacetic ester derivative represented by the general formula (5) is provided:
where R
4
represents an alkyl group having 2 to 6 carbon atoms; R
5
represents an alkyl group having 1 to 10 carbon atoms; and X represents H, Li, Na or K.
Diastereoselective and diastereoconvergent syntheses of 2- and 3-substituted morpholine congeners are reported. Starting from tosyl-oxazatedine 1 and α-formyl carboxylates 2, base catalysis is utilized to yield morpholine hemiaminals. Their further synthetic elaborations allowed the concise constructions of conformationally rigid morpholines. The observed diastereoselectivities and the unusual diastereoconvergence