Aminoalkyl benzoxazine and benzthiazine compounds having a high 5-HT.sub.1A affinity

A compound selected from those of formula (I):

• ##STR14## in which:
• R.sub.1 represents hydrogen or lower alkyl,
• n represents 1 or 2,
• A represents oxygen or sulfur,
• X represents a CH.sub.2 group,
• R.sub.2 represents hydrogen or lower alkyl or lower acyl and R.sub.3 represents (CH.sub.2)pR.sub.4, with p being an integer from 1 and 6, inclusive, and R.sub.4 represents:
• a nitrile group, in which case R.sub.3 represents (CH.sub.2).sub.p-1 R.sub.4, or halogen or amino optionally substituted with:
• (lower alkyl) sulfonyl,
• phenylsulfonyl optionally substituted on the phenyl ring with one or more lower alkyl, lower alkoxy, hydroxyl, or trifluoromethyl groups or a halogen atom,
• one or two (C.sub.1 -C.sub.6) acyl groups optionally substituted with a lower alkyl, lower alkoxy, or hydroxyl group, a halogen atom, or a phenyl, thienyl, benzothienyl, indolyl, furyl, or benzofuryl group, the phenyl, thienyl, benzo-thienyl, indolyl, furyl and benzofuryl groups themselves optionally being substituted with one or more lower alkyl, lower alkoxy, or hydroxyl groups or a halogen atom,
• one or two linear or branched (C.sub.1 -C.sub.6) alkyl groups,
• or R.sub.4 represents any one of the following groups:
• ##STR15## in which:
• Y and Y', which may be identical or different, represent hydrogen, halogen or lower alkyl, lower alkoxy, or hydroxyl group,
• m is 1 or 2,
• its enantiomers, diastereoisomers, and epimers, and its addition salts with a pharmaceutically-acceptable acid or a pharmaceutically-acceptable base when R.sub.1 =H.