The reactivity of organophosphorus compounds. Part XXX. Iminophospholes and a new synthesis of benzofurazans via intramolecular rearrangement of 1-o-nitroarylimino-1,2,5-triphenylphospholes
作者:J. I. G. Cadogan、Robert J. Scott、Robert D. Gee、Ian Gosney
DOI:10.1039/p19740001694
日期:——
1-aroylimino-1,2,5-triphenylphospholes (2; X = PhCO and p-NO2·C6H4CO), but these decomposed at this temperature to give the corresponding aryl cyanides and the phosphole oxide. The use of copper-bronze reduced the decomposition point of the dioxazolidin-2-ones sufficiently for the iminophospholes to be isolated. Base catalysed decomposition of ethyl N-(p-nitrophenylsulphonyloxy)carbamate (4) in the presence of
已经合成了一系列的N-取代的1-亚氨基-1,2,5-三苯基磷(2)。芳基,甲磺酰基,芳基磺酰基,乙氧基羰基,苯氧基羰基和二苯基次膦酰基叠氮化物与1,2,5-三苯基膦的反应得到相应的N-取代的1-亚氨基膦[2; X = Ar,MeSO 2,ArSO 2,EtO 2 C,PhO 2 C和Ph 2 P(O)],通过非亚硝基苯路线的收率很高。甲苯磺酰磷(2; X =甲苯磺酰基)也是通过无水氯胺-T反应制得的。与磷脂。苯甲酰叠氮化物通过分解反应,然后进行库尔修斯重排反应,而不是与相对较弱的亲核性1,2,5-三苯基磷脂反应(参见Ph 3 P)。缺电子的4-硝基苯甲酰基和2,4-二硝基苯甲酰基叠氮化物给出相应的1-芳基氨基-1,2,5-三苯基磷[2; X = C 6 H ^ 4 NO 2 - p和2,4-(NO 2)2 C ^ 6 ħ 3在6和55%的产率分别]。在铜存在下的5,7-二甲基四唑并[1,5-
Iron-catalysed, hydride-mediated reductive cross-coupling of vinyl halides and Grignard reagents
作者:Bryden A. F. Le Bailly、Mark D. Greenhalgh、Stephen P. Thomas
DOI:10.1039/c1cc14622j
日期:——
hydride-mediated reductive cross-coupling reaction has been developed for the preparation of alkanes. Using a bench-stable iron(II) pre-catalyst, reductive cross-coupling of vinyl iodides, bromides and chlorides with aryl- and alkyl Grignardreagents successfully gave the products of formal sp(3)-sp(3) cross-coupling reactions.
Synthesis of Polysubstituted Imidazoles and Pyridines<i>via</i>Samarium(III) Triflate-Catalyzed [2+2+1] and [4+2] Annulations of Unactivated Aromatic Alkenes with Azides
作者:Yingchun Wang、Jiuling Li、Yan He、Yuyang Xie、Hengshan Wang、Yingming Pan
DOI:10.1002/adsc.201500584
日期:2015.10.12
Samarium(III) triflate-catalyzed [2+2+1] and [4+2] annulations have been identified for the preparation of fully substituted imidazoles and 2,3,5-trisubstituted pyridines from the readily available unactivatedaromaticalkenes and azidomethyl aromatics. These reactions proceeded smoothly with one- or two-nitrogen synthons to afford a range of two types of skeletally distinct N-heterocycles in good
Reactivity differences between 2,4- and 2,5-disubstituted zirconacyclopentadienes: a highly selective and general approach to 2,4-disubstituted phospholes
作者:Guillaume Bousrez、Florian Jaroschik、Agathe Martinez、Dominique Harakat、Emmanuel Nicolas、Xavier F. Le Goff、Jan Szymoniak
DOI:10.1039/c3dt51158h
日期:——
Cp2ZrCl2/lanthanum system. Reactions of dihalophosphines with these mixtures afforded selectively the corresponding 2,4-disubstituted phospholes and 1,4-disubstituted butadienes. A new series of phospholes was characterized by multi-nuclear NMR spectroscopy and X-ray analysis. A possible explanation for the observed selectivity was obtained from X-ray studies and DFT analysis of the intermediate zirconacyclopentadienes
Anil-Synthese. 3. Mitteilung [1] Über die Darstellung von Styryl-Derivaten aus methyl-substituierten carbocyclischen Aromaten
作者:A. E. Siegrist、P. Liechti、H. R. Meyer、K. Weber
DOI:10.1002/hlca.19690520836
日期:——
1,4-Diphenylbutadien-, Tolan-, 1,4-Diphenylbutadiin-, Naphtalin-, Anthracen-und Phenanthren-Reihe werden mit Anilen aromatischer Aldehyde in Dimethylformamid in Gegenwart von Kaliumhydroxid oder Kalium-t-butylat zu Styryl-Derivaten umgesetzt.
甲基取代碳环芳烃,二苯基,三联苯,Stilben-,1,4-二苯基丁二烯-,Tolan-,1,4-二苯基丁二烯-,萘酚-,蒽环与苯并蒽-苯并二氮杂-苯并二氢萘Gegenwart von Kaliumhydroxid oder Kal-叔丁基中的二甲基甲酰胺。