A Convenient Synthesis of Substituted Benzofuro[3,3a-d]-Isoxazole-3,4-Dicarboxylates and the Reaction Mechanism

References

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• The compounds 1a and 1c were prepared by the method of Ref. 4. la: mp. 156–157.5°C (acetone-hexane), MS (m/z): 297 (M+); 1c: mp. 151–152°C (methanol), MS (m/z): 357 and 359 (M+)
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• The hydroxy derivatives (4) were acetylated and/or p-nitrobenzoylated to give the corresponding 0-acylated derivatives (5)
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• All new compounds gave consistent spectral data and correct elemental analyses.
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