HYDROXY-4-INDOL-DERIVATE, VERFAHREN ZUR HERSTELLUNG UND IHRE ANWENDUNG

• Main Authors: DESCAMPS, MARCEL, VERSTRAETEN, WALTER
• Format: Patent
• Language: French; German
• Published: 15.08.1989
• Edition: 4
• Subjects: CHEMISTRY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY

1. Claims for the Contracting States : BE, CH, DE, FR, GB, GR, IT, LI, LU, NL, SE 4-Hydroxyindole derivatives of general formula : see diagramm : EP0228356,P20,F1 in which R represents a labile protective group and R1 can represent : - hydrogen - a straight- or branched-chain C1-6 alkyl radical, - a C3-6 cycloalkyl radical, - a C1-4 alkoxy radical, - a C1-4 hydroxyalkyl radical, - a C1-4 alkoxy C1-4 alkyl radical, - a phenyl radical optionally substituted with a halogen atom or with a C1-4 alkyl or C1-4 alkoxy radical, - a cyano radical, - a radical of formula : see diagramm : EP0228356,P20,F2 see diagramm : EP0228356,P20,F3 or see diagramm : EP0228356,P20,F4 in which : R2 and R3 , which may be identical or different, each represent hydrogen or a C1-4 alkyl radical, R4 represents a hydroxy group, a C1-4 alkyl or C1-4 alkoxy radical or a radical see diagramm : EP0228356,P20,F5 in which R2 and R3 have the same meaning as above, R5 represents a C1-4 alkyl radical, and Alk represents a single bond or a straight- or branched-chain alkylene radical having from 1 to 4 carbon atoms. 1. Claims for the Contracting States : AT and ES Process for preparing 4-hydroxyindole derivatives of general formula : see diagramm : EP0228356,P23,F1 in which R represents a labile protective group and R1 can represent : - hydrogen - a straight- or branched-chain C1-6 alkyl radical, - a C3-6 cycloalkyl radical, - a C1-4 alkoxy radical, - a C1-4 hydroxyalkyl radical - a C1-4 alkoxy C1-4 alkyl radical, - a phenyl radical optionally substituted with a halogen atom or with a C1-4 alkyl or C1-4 alkoxy radical, - a cyano radical, - a radical of formula see diagramm : EP0228356,P23,F2 see diagramm : EP0228356,P23,F3 or see diagramm : EP0228356,P23,F4 in which : R2 and R3 , which may be identical or different, each represent hydrogen or a C1-4 alkyl radical, R4 represents a hydroxy group, a C1-4 alkyl or C1-4 alkoxy radical or a radical see diagramm : EP0228356,P23,F5 in which R2 and R3 have the same meaning as above, R5 represents a C1-4 alkyl radical, and Alk represents a single bond or a straight- or branched-chain alkylene radical having from 1 to 4 carbon atoms, whereby an N-protected indole derivative of general formula : see diagramm : EP0228356,P23,F6 in which R and R1 have the same meaning as above, is reacted, in a suitable medium and at the reflux temperature, with epichlorohydrin or epibromohydrin in the presence of a metallating agent and optionally in the presence of a phase transfer catalyst.