An Efficient Intramolecular 1,3-Dipolar Cycloaddition Involving 2-(1,2-Dichlorovinyloxy)aryldiazomethanes: A One-Pot Synthesis of Benzofuropyrazoles from Salicylaldehydes.

[摘要]：A novel intramol. 1,3-dipolar cycloaddn. strategy for a rapid entry into benzofuropyrazoles is described. In a three-step sequence, (E)-2-(1,2-dichlorovinyloxy)aryldiazomethanes were generated in situ from the corresponding salicylaldehydes. Intramol. cycloaddn. followed by dehydrohalogenation garnered 3-chlorobenzofuropyrazoles in excellent yields. By careful choice of solvent, base, and reaction conditions, the entire sequence can be carried out in a one-pot procedure.

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