Some fatty acids having an O-heterocycle in their terminal positions. II. ω-(3-Coumarinyl)alkanoic acids and ω-(2-chromonyl)alkanoic acids

Some ω-3-coumarinyl)alkanoic acids 1a , n = 3-6 were synthesized by cyclization of corresponding ethyl o-formylphenyl alkanedioate 3 with DBU followed by hydrolysis. By a similar cyclization, some ω-(2-chromonyl)alkanoic acids 2a , n = 3-6 were also obtained from the cyclization of corresponding o-acetylphenyl ethyl alkanedioate 4 .