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.
                                    1,1-
二乙酰基
环丙烷(1)与许多
肼和
羟胺衍
生物的反应通过
环丙烷开环进行,并引入外部亲核试剂(溶剂),得到
3,5-二甲基吡唑的4-β-X-乙基衍
生物和-
异恶唑,这些杂环的新途径。这种环断裂在作为溶剂的
水中特别平滑地发生。讨论了这种异常温和的亲核
环丙烷开环的原理。