1,1-bis(heteroazolyl)alkane derivatives and their use as neuroprotective
申请人:——
公开号:US05665747A1
公开(公告)日:1997-09-09
The present invention relates to novel heterocyclic compounds having the general formula (1) ##STR1## wherein: X.sub.1 and X.sub.2 are independently O, S or Se; Y.sub.1 and Y.sub.2 are independently C or N with the proviso that at least one of Y.sub.1 and Y.sub.2 is N; Y.sub.3 and Y.sub.4 are independently C or N with the proviso that at least one of Y.sub.3 and Y.sub.4 is N; R.sub.1 and R.sub.2 each represent one or more groups independently selected from H, lower alkyl, lower alkoxy-lower alkyl, hydroxy-lower alkyl, lower acyloxy-lower alkyl or CF.sub.3 ; and A is ##STR2## geometrical and optical isomers and racemates thereof where such isomers exist, as well as pharmaceutically acceptable acid addition salts thereof and solvates thereof; having therapeutic activity, processes and intermediates for their preparation, pharmaceutical formulations containing said compounds and the medicinal use of said compounds.
Intramolecular insertion of the isonitrile group into an oxygen–silicon bond. Synthesis of a 2-trimethylsilyloxazole via the α-isocyano silyl enol ether
Treatment of lithiated 4-methyloxazole (1b) with trimetylsilyl chloride gives the α-isocyanosilylenolether (4b) which when heated in the presence of potassium hydroxide undergoes ring closure to the 2-trimethylsilyloxazole (5b) whose reactions with C-and S-electrophiles afford 2-substituted oxazoles.
1, 1-BIS (heteroazolyl) alkane derivatives and their use as
申请人:Astra Aktiebolag
公开号:US05843971A1
公开(公告)日:1998-12-01
The present invention relates to novel heterocyclic compounds having the general formula (1) ##STR1## wherein: X.sub.1 and X.sub.2 are independently O, S or Se; Y.sub.1 and Y.sub.2 are independently C or N with the proviso that at least one of Y.sub.1 and Y.sub.2 is N; Y.sub.3 and Y.sub.4 are independently C or N with the proviso that at least one of Y.sub.3 and Y.sub.4 is N; R.sub.1 and R.sub.2 each represent one or more groups independently selected from H, lower alkyl, lower alkoxy-lower alkyl, hydroxy-lower alkyl, lower acyloxy-lower alkyl or CF.sub.3 ; and A is ##STR2## geometrical and optical isomers and racemates thereof where such isomers exist, as well as pharmaceutically acceptable acid addition salts thereof and solvates thereof; having therapeutic activity, processes and intermediates for their preparation, pharmaceutical formulations containing said compounds and the medicinal use of said compounds.