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Communication | Regular issue | Vol 23, No. 6, 1985, pp.1395-1398
Published online, 1st January, 1970
DOI: 10.3987/R-1985-06-1395
1,3-Dipolar Cycloaddition Reaction of Chromones and Coumarin with Pyridinium Ylides

Ichiro Yokoe,* Shunsuke Matsumoto, Yoshiaki Shirataki, and Manki Komatsu

*Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan


1,3-Dipolar cycloaddition reaction of N-iminopyridinium ylide (2) with chromones (1) gave pyrazolo[1,5-a]pyridines (3) in moderate yields. Similarly coumarin (4) reacted with 2 to give 6H-[1]-benzopyrano [4’,3’:3,4]pyrazoro[1,5-a]pyridin-6-one (5) . Furthermore chromone (1) was cyclized with pyridinium phenacylide (6) to afford 1-(2’-hydroxybenzoyl)-3-benzoylindolizine (7)