Piperazine derivatives as 5-HT.sub.1A ligands
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United States of America Patent
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Dec 2, 1997
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app pub date -
May 24, 1995
filing date -
Mar 24, 1993
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Abstract
Piperazine derivatives of formula (I) and their salts are 5-HT.sub.1A binding agents and may be used, for example, as anxiolytics. In the formula, R, R.sup.2 and R.sup.4 are hydrogen or lower alkyl, R.sup.1 is mono- or bicyclic aryl or heteroaryl, R.sup.3 is lower alkyl or cycloalkyl, A is an alkylene chain and X is --CO--. --CR.sup.5 OH-- (where R.sup.5 is hydrogen, lower alkyl or cycloalkyl), --S--, --SO-- or --SO.sub.2 -- or X can also be --(CH.sub.2).sub.n -- (where n is 0, 1 or 2) when R.sup.3 is cycloalkyl. ##STR1##
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