الفهرس 
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Abstract
3 N-( P-methoxy) phenyl carbamido- coumarin ( Ia-B) wrew prepared by the action of benzylamine and/ or p-anisidine on 3- carbethoxy coumarin. the reaction of ( Ia-b) with alkyl and or arylmagnesium halides yielded 4-alkyl (aryl) 3 n- aryl carbamido-3,4-dihydro coumarins ( 11a-J).4- substiuted 3,4-dihydro-coumarins(lll)and (lv) were prepared by michael condensation of (l) with ethylacetoace-tate and/or acetylacetone in the presence of sodium ethoxide. but michael condensation of (l) with acetophenone in presence. but michael condensation of (l) with acetophenone in presence of ammonium acetate gave benzopyrano- (3,4-c)-pyridine diones (v), with aliphatic ketones gave 2-alkyl-4oxo-3,4,5,6-tetrahydro-2,6-methano (2h)-1,3-benzoxazocines-5-carboxamides (vla-b), (xa-b) and (xla-b), and/or with excess cyclic ketone gave 12-oxo-hexa-hydro (o-pentahydro) 4a, 9-imino-(4a-h)- xanthone-11-carboxamides (xllla-b).