.alpha.-[5H-dibenzo[a,d]cyclohepten-5-ylidene]-carboxylic acids e.g. of formula I ##STR1## wherein R.sub.1 is H, C.sub.1-4 alkyl or phenyl-(C.sub.1-4 alkyl), R.sub.2 is H or C.sub.1-4 alkyl and ring A is unsubstituted or halo- or hydroxy-substituted, as well as the physiologically-hydrolysable and -acceptable esters thereof have valuable pharmaceutical, in particular anti-inflammatory, antipyretic and analgesic properties.
作者:Pietro Bollinger、Philip Cooper、Hans U. Gubler、Albert Leutwiler、Trevor Payne
DOI:10.1002/hlca.19900730507
日期:1990.8.8
order to prepare derivatives with a wide variety of substituents in the aromatic part of the molecule, a new synthesis of the key intermediates 9a-g was developed starting from thiophene-3-carboxylic acid (11) and substituted benzyl bromides. The conversion of 9a-g to 10a-g follows a known procedure. Ketones 10a-g, on reaction with alkyl (dialkoxy-phosphoryl)acetate, followed by isomer separation and