The Intramolecular Participation of Sulfide Linkage on the Reactivity of Carbenes and Diazoalkanes. II. Alkylcarbenes and Diazoalkanes Bearing Arylthio and Allylthio Groups on β-Carbon
作者:Kiyosi Kondo、Iwao Ojima
DOI:10.1246/bcsj.48.1490
日期:1975.5
β-Arylthio- and β-allylthioalkylcarbenes were generated from the corresponding ketones by a modification of the Bamford-Stevens method. Chemical evidence for the formation of novel cyclic ylides, i.e., thietanonium ylides, by an intramolecular electrophilic addition of the carbene to the sulfur atom was obtained. The resulting ylides underwent various types of rearrangements to afford cyclopropyl sulfides, thiaazulenes, thietanes, and/or tetrahydrothiophenes. The mechanisms and the relative amounts of the transition energies for these rearrangements are discussed. An intramolecular cycloaddition of β-allyl- and β-crotylthioalkyldiazoalkanes is also described. The final products of the reaction were 3-thiabicyclo[4.1.0]heptanes. A thiabicyclic pyrazoline, which is presumed to be an intermediate of the cycloaddition, could be isolated in the case of the thermal decomposition of 4-allylthio-4-methylpentan-2-one tosylhydrazone.
通过改进 Bamford-Stevens 方法,从相应的酮生成 β-芳硫基-和 β-烯丙硫基烷基卡宾。获得了通过卡宾与硫原子的分子内亲电加成形成新型环状叶立德(即硫杂鎓叶立德)的化学证据。所得叶立德经历各种类型的重排,得到环丙基硫醚、噻薹、硫杂环丁烷和/或四氢噻吩。讨论了这些重排的机制和跃迁能的相对量。还描述了β-烯丙基-和β-巴豆基硫烷基重氮烷的分子内环加成。反应的最终产物是3-硫代双环[4.1.0]庚烷。硫代双环吡唑啉被认为是环加成的中间体,可以在4-烯丙硫基-4-甲基戊-2-酮甲苯磺酰腙热分解的情况下分离出来。