Overcoming solid handling issues in continuous flow substitution reactions through ionic liquid formation
作者:Saeed K. Kashani、Ryan J. Sullivan、Mads Andersen、Stephen G. Newman
DOI:10.1039/c8gc00618k
日期:——
the use of acid scavenging organic bases that generate low- to moderate-melting ionicliquids upon protonation. The application of these bases towards the most commonly run substitutions are demonstrated, enabling reactions to be run in flow without requiring additional equipment, specific solvents, or dilute reaction conditions to prevent clogging.
Synthesis of polynuclear heterocycles. Part II. Cyclisations of 2- and 4-substituted 3-amino- and 3-nitro-pyridines
作者:J. J. Eatough、L. S. Fuller、R. H. Good、R. K. Smalley
DOI:10.1039/j39700001874
日期:——
Treatment of 2- and 4-phenoxy-3-nitropyridine with triethyl phosphite failed to yield the expected pyridobenz-oxazines; 2- and 4-phenylthio-3-nitropyridine, however, cyclised to give 5H-pyrido [2,3-b][1,4] benzothiazine and 5H-pyrido[3,4-b][1,4]benzothiazine respectively, albeit in poor yield. Similar results were obtained by thermolytic decomposition of the corresponding 2- and 4-substituted 3-azido-pyridines
用亚磷酸三乙酯处理2-和4-苯氧基-3-硝基吡啶不能得到预期的吡啶并恶唑。然而,将2-和4-苯硫基-3-硝基吡啶环化,得到5 H-吡啶[2,3- b ] [1,4]苯并噻嗪和5 H-吡啶[3,4- b ] [1,4]苯并噻嗪虽然收率差。通过相应的2-和4-取代的3-叠氮基吡啶的热解分解获得相似的结果。已经合成了9-羟基吡啶并[2,3- b ] 1,4,5-苯并二氮杂卓。
2-Phenylsulfinyl-nitro-pyridine, Verfahren zu ihrer Herstellung und ihre Verwendung
申请人:BAYER AG
公开号:EP0337560A2
公开(公告)日:1989-10-18
Die Erfindung betrifft 2-Phenylsulfinyl-nitro-pyridine der Formel
in der
R₁ Wasserstoff, Alkyl oder Halogen bedeutet und
R₂,R₃,R₄,R₅ und R₆ unabhängig voneinander für Wasserstoff, Halogen, Alkyl, Haloalkyl, Alkoxy, Haloalkoxy, Cyano, Nitro, Carboxy, Alkoxycarbonyl, Carbonamido, N-Alkyl- oder N,N-Dialkylcarbonamido, Acyl oder primäres, sekundäres oder tertiäres Amino stehen.
Verfahren zu ihrer Herstellung und ihre Verwendung als Mikrobizide für den Materialschutz und Fungizide im Pflanzenschutz.
Takahashi; Shibasaki, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1952, vol. 72, p. 1141,1143
作者:Takahashi、Shibasaki
DOI:——
日期:——
Green Chemical Synthesis of 2-Benzenesulfonyl-pyridine and Related Derivatives
作者:William G. Trankle、Michael E. Kopach
DOI:10.1021/op700060e
日期:2007.9.1
A practical synthesis of 2-benzenesulfonylpyridine, 1, is described which is a key starting material for the manufacture of an investigational new drug candidate at Eli Lilly and Company. An optimized green chemical process was developed which features a novel tandem SNAr/oxidation under mild conditions to produce the target sulfone, 1, in 86% yield and >99% purity. In addition, this novel, environmentally friendly methodology was found to be general for the synthesis of substituted aromatic pyridyl sulfides and sulfones.