PALLADIUM(II)-CATALYZED SELECTIVE FLUORINATION OF BENZOIC ACIDS AND DERIVATIVES
申请人:YU JIN-QUAN
公开号:US20140018566A1
公开(公告)日:2014-01-16
A new method of ortho-fluorination for selectively fluorinating a benzoic acid or derivative compound where an aryl C—H bond is directly replaced by an aryl C—F bond is provided. The method comprises reacting a compound having the formula:
wherein X is at least one substitution group attached with a benzene ring and Ar is an aromatic substitution group comprising at least one fluorine atom,
and a mixture comprising a palladium (II) catalyst and a fluorinating reagent to form at least one of the ortho-fluorinated compounds having the formulae
with good yield and selectivity.
Reaction of metal diethylnitroxides with pentafluoropyridine, pentafluorobenzene, octafluorotoluene and 2-chloro-3- or 5-nitropyridine
作者:Adrian J. Adamson、Waheed J. Jondi、Anthony E. Tipping
DOI:10.1016/0022-1139(95)03355-6
日期:1996.1
mainly via an SRNl mechanism involving single electron transfer (SET) from the nitroxide 2 to the substrate 3 leading to the radicalanion (21) and hence the tetrafluoro-4-pyridyl radical (22) which reacted with 2 at nitrogen to afford the amine oxide 20. Major Meisenheimer rearrangement of 20 gave hydroxylamine 9, while minor rearrangement afforded the hydroxylamine Py-N(Et)OEt (23) which eliminated
的氮氧自由基的Et治疗2 NO -中号+ (2A-C)(M =钠,锂,K)和(ET 2 NO - )2的Ba 2+ (2D)与五氟(3)在室温下(1 d)在所有情况下均得到化合物Py-NEt 2 (8),Py-ONEt 2 (9),Py-NHEt (10)和Py-O - H 2 NEt 2 (11)(其中Py =四氟-4-吡啶基)以大约1:30:30:35的比例 自由基捕集剂1,4-二硝基苯或galvinoxyl延迟了反应(5 d为完全消耗3),但相同的产物以相似的比例形成,化合物8-11也通过氧化胺Py-N +(t)Et 2 (20)的分解[通过以下途径合成:3 + Et 2 NH→ 8(57%);8 +(CF 3 CO)2 O / H 2 O 2 → 20(81%)一水合物]。提议产物8-11主要是通过S RNl机理产生的,该机理涉及从氮氧化物2到基质3的单电子转移(SET),从而导致
Reaction of sodium diethylnitroxide with fluorobenzenes, pentafluoropyridine and halogenopyridines
作者:Ronald Eric Banks、Waheed Jondi、Anthony Edgar Tipping
DOI:10.1016/s0022-1139(00)82809-2
日期:1989.9
BANKS, RONALD ERIC;JONDI, WAHEED;TIPPING, ANTHONY EDGAR, J. FLUOR. CHEM., 44,(1989) N, C. 441-444
作者:BANKS, RONALD ERIC、JONDI, WAHEED、TIPPING, ANTHONY EDGAR