Formaldehyde: A Reagent for Simultaneous Protection of Heterocyclic NH and Activation of Alternative Locations to Electrophilic Attack. Part II. A New Synthetic Method for the 5(3)-Substitution of N-Unsubstituted Pyrazoles
作者:Alan R. Katritzky、Ping Lue、Kunihiko Akutagawa
DOI:10.1016/s0040-4020(01)81320-x
日期:1989.1
N-Unsubstituted pyrazole 1 is readily converted into 5-substituted [tautomeric with 3-substituted 8] derivatives 2 in moderate to good overall yields in a one-pot sequence, using formaldehyde both for N-protection and to mediate lithiation at the 5-position. The dilithiohemiaminals 5 react with electrophiles at the pyrazole 5-position to give 5-substituted 1-lithioxymethylpyrazoles 6 which undergo
THIENYLAZOLYLALCOXYETHANAMINES, THEIR PREPARATION AND THEIR APPLICATION AS MEDICAMENTS
申请人:LABORATORIOS DEL DR. ESTEVE, S.A.
公开号:EP1072266A1
公开(公告)日:2001-01-31
The thienylazolylalkoxyethanamines (I) where R1 is a hydrogen atom, a halogen atom or a lower alkyl radical; R2, R3 and R4 represent, independently, a hydrogen atom or a lower alkyl radical; and Az represents a five-member nitrogenated hetercyclic aromatic group, N-methyl-substituted, that contains from one to three nitrogen atoms. They have analgesic activity in mammals, including humans. The compounds (I) can be obtained, for example, by reaction of a derivative of hydroxy-thienylazol (IV) with a derivative of a suitable N-(ethyl)amine. The compounds (IV) are useful intermediates in the synthesis of the compounds (I). The compounds (I) have an application in human and/or veterinary medicine.
Thienylazolylalkoxyethanamines, their preparation and their application as medicaments
申请人:LABORATORIOS DEL DR. ESTEVE, S.A.
公开号:US20020188017A1
公开(公告)日:2002-12-12
The thienylazolylalkoxyethanamines (I) where R1 is a hydrogen atom, a halogen atom or a lower alkyl radical; R2, R3 and R4 represent, independently, a hydrogen atom or a lower alkyl radical; and Az represents a five-member nitrogenated hetercyclic aromatic group, N-methyl-substituted, that contains from one to three nitrogen atoms. They have analgesic activity in mammals, including humans. The compounds (I) can be obtained, for example, by reaction of a derivative of hydroxy-thienylazol (IV) with a derivative of a suitable N-(ethyl)amine. The compounds (IV) are useful intermediates in the synthesis of the compounds (I). The compounds (I) have an application in human and/or veterinary medicine.