摘要:
A process for the preparation of a (.+-.)-trans-cyclopropanecarboxylic acid salt thereof of the formula ##STR1## in which R is halogen or C.sub.1 -C.sub.4 -alkyl, andR.sup.1 is hydrogen or the equivalent of a metal ion,which comprises contacting a (.+-.)-trans-cyclo-propane-carboxylic ester of the formula ##STR2## in which R.sup.2 is methyl or ethyl,with a hydrolase which is of microbial origin and isolating the resulting (.+-.)-trans-cyclopropanecarboxylic acid.
摘要:
A process is disclosed for the preparation of a 7 Beta -(4carboxybutanamide) ceph-3-3em-4-carboxylic acid or a 7 Beta -(5carboxy-5-oxopentamido) ceph-3-em-4-carboxylic acid by subjecting a 7 Beta -(D-5-amino-5-carboxypentamido) ceph-2-em-4-carboxylic acid to the action of a cell-free fungal D-amino acid oxidase. The modified cephalosporin compounds produced exhibit antimicrobial activity and are useful as presursors in the synthesis of 7-aminocephalosporanic acid and 7 Beta -acylamido analogues of cephalosporin C.
摘要:
Method for preparing 3(S or R)-hydroxy-1-iodo-1-trans-octene to the fermentative action of a microorganism of the classes Ascomycetes, Phycomycetes and Fungi Imperfecti. The compounds are key intermediates in the preparation of prostaglandins of the E2, F2, A2 and B2 series.
摘要:
Process for carrying out an enzymatic reaction, in which the substrate treated is in an organic liquid which is a fluorinated hydrocarbon, which can include halogens other than fluorine.
摘要:
A method for preparing optically active 2-substituted-4-hydroxycyclopentane-1,3-diones by subjecting 2-substituted cyclopentane1,3,4-trione or 2-substituted-3-alkoxy-2-cyclopentene-1,4-dione to the fermentative enzymatic action of microorganisms of the orders Endomycetales, Mucorales, Moliliales and Eurotiales.