6952-91-6Relevant academic research and scientific papers
PROCESS FOR CARBONYLATING PHENYLALKYL DERIVATIVES BY MEANS OF CARBON MONOXIDE
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, (2008/06/13)
The invention is directed a process of preparing a compound of formula (I), wherein R1, R2, R3 and z are as defined herein.
METHOD FOR CARBONYLATING PHENYLALKYL DERIVATIVES BY MEANS OF CARBON MONOXIDE
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Page/Page column 49-50, (2010/02/15)
The invention relates to a method for producing a phenylalkyl carboxylic acid of general formula (I), wherein identical or different R1 and R2 represent independently of each other -(C1-C4)-alkyl, Z is a hydrogen atom or -(CH2) n-CH3, wherein n=0 to 9, and R3 is-C(0)-(C1-C4)-alkyl which is substituted or not-substituted by CI or Br, only, or -C(0)-(C3-C6)-cycloalkyl, consisting in reacting a compound of formula (II), wherein X is Cl or Br or OH and R4 is defined as R2 rest represents jointly with X a C-C double bond with a carbon monoxide in the presence of a concentrated sulphuric acid, hydrogen fluoride or peracids and subsequently in adding water or alcohol of the formula CH3-(CH2)n-OH, wherein n=0 to 9.
Intermediates useful for the preparation of antihistaminic piperidine derivatives
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, (2008/06/13)
The present invention is related to a novel intermediates and processes which are useful in the preparation of certain antihistaminic piperidine derivatives of the formula wherein W represents —C(═O)— or —CH(OH)—; R1represents hydrogen or hydroxy; R2represents hydrogen; R1and R2taken together form a second bond between the carbon atoms bearing R1and R2; n is an integer of from 1 to 5; m is an integer 0 or 1; R3is —COOH or —COOalkyl wherein the alkyl moiety has from 1 to 6 carbon atoms and is straight or branched; each of A is hydrogen or hydroxy; and pharmaceutically acceptable salts and individual optical isomers thereof, with the proviso that where R1and R2are taken together to form a second bond between the carbon atoms bearing R1and R2or where R1represented hydroxy, m is an integer 0.
Intermediates useful for the preparation of antihistaminic piperidine derivatives
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, (2008/06/13)
The present invention is related to a novel intermediates and processes which are useful in the preparation of certain antihistaminic piperidine derivatives of the formula wherein W represents -C(=O)- or -CH(OH)-; R1 represents hydrogen or hydroxy; R2 represents hydrogen; R1 and R2 taken together form a second bond between the carbon atoms bearing R1 and R2; n is an integer of from 1 to 5; m is an integer 0 or 1; R3 is -COOH or -COOalkyl wherein the alkyl moiety has from 1 to 6 carbon atoms and is straight or branched each of A is hydrogen or hydroxy; and pharmaceutically acceptable salts and individual optical isomers thereof, with the proviso that where R1 and R2 are ta to form a second bond between the carbon R1 and R2 or where R1 represented hydroxy integer 0.
