作者:Nikolai S. Zefirov、Sergei I. Kozhushkov、Tamara S. Kuznetsova
DOI:10.1016/0040-4020(82)80149-x
日期:1982.1
hydroxylamine derivatives proceed via cyclopropane ring opening with incorporation of external nucleophile (solvent) to give the 4-β-X-ethyl derivatives of 3,5-dimethylpyrazoles and -isoxazoles, a novel route to these heterocycles. This ring cleavage occurs especially smoothly in water as a solvent. A rationale for this unusually mild nucleophilic cyclopropane ring opening is discussed.