已实现了钯催化的三组分羰基化反应,该反应可从酰氯和NaN 3合成3 H -1,2,4-三唑-3-酮。该反应大概通过级联羰基化,酰基叠氮化物形成,Curtius重排和分子内亲核加成序列进行。以中等至优异的产率构建了各种结构多样的3 H -1,2,4-三唑-3-酮。1,2,3,5-三甲酸三苯酯(TFBen)被用作固体和方便的一氧化碳替代物。
The double 1,3-dipolar cycloaddition of allenoates with nitrilimines has been achieved under mild reaction conditions, affording a variety of spirobidihydropyrazoles in moderate to excellent yields with excellent diastereoselectivities. The reaction diastereoselectively constructs double dihydropyrazole moieties and two chiral centers including a spiro carbon center.
A [4 + 3] Annulation Reaction of aza-<i>o</i>-Quinone Methides with Arylcarbohydrazonoyl Chlorides for Synthesis of 2,3-Dihydro-1<i>H</i>-benzo[<i>e</i>][1,2,4]triazepines
An unprecedented [4 + 3] annulation reaction of aza-ortho-quinone methides with arylcarbohydrazonoyl chlorides has been achieved under mild conditions. The annulation underwent a sequential conjugate addition/intramolecular annulation/rearrangement, providing a useful method for the synthesis of biologically interesting 2,3-dihydro-1H-benzo[e][1,2,4]triazepine.
在温和的条件下,已完成了氮杂-邻苯醌甲基化物与芳基羰基肼基甲酰氯的前所未有的[4 + 3]环化反应。进行连续的共轭加成/分子内的成环/重排,为生物上有趣的2,3-二氢-1 H-苯并[ e ] [1,2,4]三氮杂卓合成提供了有用的方法。
[3 + 3]-Cycloaddition of Donor–Acceptor Cyclopropanes with Nitrile Imines Generated in Situ: Access to Tetrahydropyridazines
作者:Lennart K. B. Garve、Martin Petzold、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.orglett.5b03598
日期:2016.2.5
Donor–acceptor cyclopropanes are reacted under the influence of a Lewis acid with hydrazonyl chlorides to afford tetrahydropyridazines. Formally, this transformation can be regarded as a [3 + 3]-cycloaddition of three-memberedrings and nitrile imines generated in situ. This efficient method provides fast access to a variety of structurally diverse pyridazine derivatives. The structure of a typical product was
Reactions of molybdenum oxo-complexes with substituted hydrazines. Part 1. The preparation of molybdenum alkyl- and aryl-imido-complexes; the crystal and molecular structure of (N-benzoyl-N′-p-tolyldiazene-N′O)dichloro(dimethylphenylphosphine)(p-tolylimido)molybdenum
作者:Michael W. Bishop、Joseph Chatt、Jonathan R. Dilworth、Michael B. Hursthouse、S. Amarasiri A. Jayaweera、Andrew Quick
DOI:10.1039/dt9790000914
日期:——
The molybdenum(IV) oxo-complexes [MoOCl2(PR″3)3](PR″3= PMe2Ph or PEt2Ph) react with the substitutedhydrazines RCONHNHR′(R = Ph, p-ClC6H4, p-MeC6H4, p-MeOC6H4, Et, Prn, Pri, or CH2Ph; R′= Ph, p-ClC6H4,p-MeOC6H4, 1-C10H7, or Me) to give the imido-complexes [MoCl2(NR′)(R′N2COR)(PR″3)]. The crystal and molecularstructure of the title complex has been determined from single-crystal X-ray diffractometer
A series of simple diarylhydrazide derivatives (45 examples) were well-designed, prepared, and screened for their antifungal activities both in vitro and in vivo. Bioassay results suggested that all designed compounds had significant activity against Alternaria brassicae (EC50 = 0.30–8.35 μg/mL). Among of them, 2c, as the highest activity compound, could effectively inhibit the growth of plant pathogens