174740-81-9Relevant articles and documents
Methods for producing N-protected-azetidine-2-carboxylic acids
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, (2008/06/13)
There is disclosed a method for producing an essentially enantiomerically pure N-protected-azetidine-2-carboxylic acid of formula (1): which method is characterized by: subjecting a crude enantiomerically excess N-protected-azetidine-2-carboxylic acid comprising said enantiomer represented by formula (1) in excess to the other enantiomer thereof to crystallization in an organic solvent selected from aromatic hydrocarbon, aliphatic ether, aliphatic alcohol, aliphatic ketone, aliphatic nitrile, aliphatic amide, aliphatic sulfoxide, aliphatic ester and a mixed solvent thereof, wherein R is: an optionally substituted alkyl, alicyclic or alicyclicalkyl group, an optionally substituted alkenyl group, an optionally substituted aryl group, an optionally substituted heteroaryl group, or a dialkylamino group, and absolute configuration of the asterisked asymmetric carbon atom is S or R.
Enantioselective catalytic reductions of ketones with new four membered oxazaborolidines: Application to (S)-tetramisole
Rama Rao,Gurjar,Kaiwar
, p. 859 - 862 (2007/10/02)
Enantioselective catalytic reduction of ketones with both the enantiomers of new four membered oxazaborolidines is described.