[EN] SUBSTITUTED 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5A] PYRIDINE DERIVATIVES AND USE THEREOF [FR] DÉRIVÉS DE 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5 A] PYRIDINE SUBSTITUÉS ET LEUR UTILISATION
[EN] SUBSTITUTED 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5A] PYRIDINE DERIVATIVES AND USE THEREOF [FR] DÉRIVÉS DE 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5 A] PYRIDINE SUBSTITUÉS ET LEUR UTILISATION
Novel synthesis of monofluorocyclobutanes by the ring expansion- fluorination of cyclopropylmethanols with an amine-metal fluoride pyridinium poly(hydrogen fluoride)-complex
Various new 1-fluoro-1-alkyl(or aryl)-2-substituted cyclobutanes were synthesized stereoselectively from 1-alkyl(or aryl)cyclopropyl carbinols by the ring expansion-fluorination using (iPr)2-KHF2-(HF)n·Py, and 2-hydroxymethyl-1-fluorocyclobutanes were synthesized via a new rearrangement of (1-alkyl(or aryl)cyclopropyl) ethylene oxides.
Radical ion probes. 2. Evidence for the reversible ring opening of arylcyclopropylketyl anions. Implications for mechanistic studies
作者:James M. Tanko、Ray E. Drumright
DOI:10.1021/ja00031a045
日期:1992.2
Aryl cyclopropyl ketones have frequently been utilized as diagnostic probes for single electron transfer (SET) for a variety of organic transformations. The implicit assumption in these studies is that the formation of rearranged product(s) signals the intermediacy of a ketyl anion. Through a detailed examination of the mechanism, kinetics, and products arising from the decay of several arylcyclopropylketyl
芳基环丙基酮经常被用作各种有机转化的单电子转移 (SET) 的诊断探针。这些研究中的隐含假设是,重排产物的形成标志着羰基阴离子的中介作用。通过对几种芳基环丙基羰基阴离子(电化学产生)衰变产生的机制、动力学和产物的详细检查,我们已经证明在使用这些底物作为 SET 探针时所做的假设是脆弱的
Formation of cyclopropyl carbinols through a highly diastereoselective hydrozirconation of vinyloxirane derivatives
Cyclopropyl carbinol derivatives were efficiently prepared through a highly diastereoselective hydrozirconation of vinyloxirones and the intramolecular nucleophilic attack of the generated alkylzirconocene with the inversion of the configuration at the reacting oxirane carbon.
Cyclopentyl and cyclopropylmethanol derivatives were efficiently prepared through a chemoselective hydrozirconation reaction of (1-butenyl)oxirane and vinyloxirane with Cp2ZrHCl. However, the attemped reaction of (1-pentenyl)oxirane or (1-propenyl)oxirane failed to yield cyclohexyl or cyclobutylmethanols. The ring formation was stereospecific and proceeded with the inversion of the configuration at the reacting oxirane carbon. The origin of stereospecificity and the stereoselectivity in the formation of cyclopropylmethanols was presumed by the approach of the Schwartz reagent from the less hindered site of the stable gauche-conformer of the vinyloxirane compound in the transition state. (Cyclopropylmethyl)amine derivatives were also prepared by the treatment of vinylaziridine derivatives with Cp2ZrHCl. (C) 1997 Elsevier Science Ltd. All rights reserved.
SUBSTITUTED 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5A] PYRIDINE DERIVATIVES AND USE THEREOF