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Communication | Regular issue | Vol 36, No. 3, 1993, pp.449-454
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6264
Annulation of Heterocycles via Ring Transformation of Isoxazoline-2-oxides by Lewis Acid

Kazuho Harada,* Kuniaki Sasaki, Eisuke Kaji, and Shonosuke Zen

*School of Pharmaceutical Sciences, Kitasato University, Shirokane, Minato-ku, Tokyo 108-8641, Japan

Abstract

Novel heterocyclic-annulated furo[3,3a-d]isoxazoles were synthesized through the ring transformation reaction of heterocyclic ring-substituted isoxazoline-2-oxides promoted by Lewis acid such as titanium tetrachloride. Structural determinations by single crystal X-ray and nmr analyses are reported.