ADDITION OF NITROGEN-CONTAINING, OXYGEN-CONTAINING, AND SULFUR-CONTAINING NUCLEOPHILES TO ARYL ETHYNYL KETONES

Addition of some nitrogen-, oxygen-, and sulphur-containing nucleophiles to the aryl ethynyl ketones (1)-(4) has been examined. Addition of o-phenylenediamine and o-aminophenol yielded the corresponding cis-β-aminovinyl ketones (5)-(7) and (10)-(12). Addition of secondary amines (morpholine and piperidine) yielded the trans-β-aminovinyl ketones (13)-(20). Catechol reacted with aryl ethynyl ketones to furnish 1,3-benzodioxole derivatives (21)-(23), salicylic acid and 2-hydroxy-3-naphthoic acid to give the oxalactones (24)-(30). However, 2-hydroxy-1-naphthoic acid yielded a mixture of the oxalactones (31)-(33) and 3-naphthoxy-1-arylprop-2- enones (35) and (36). Similarly thiosalicylic acid gave the corresponding thialactones (40) and (41) as addition products. Salicylaldehyde reacted with ethynyl phenyl ketone to give 3-benzoylchrom-3-en-2-ol (38).