Harnessing Autoxidation of Aldehydes: <i>In Situ</i> Iodoarene Catalyzed Synthesis of Substituted 1,3,4-Oxadiazole, in the Presence of Molecular Oxygen
作者:Jyoti Chauhan、Mahesh K Ravva、Subhabrata Sen
DOI:10.1021/acs.orglett.9b02542
日期:2019.8.16
Isobutyraldehyde underwent auto-oxidation in the presence of molecular oxygen to generate an acyloxy radical under a “metal-free” environment. They were subsequently exploited in situ to afford hypervalent iodines with p-anisolyl iodide which generated substituted 1,3,4-oxadiazoles in moderate to excellent yields from N′-arylidene acetohydrazides. The reaction strategy tolerated diverse substitution
A general and efficient Pd/phosphoramidite thioether complex-catalyzed asymmetric N-allylic alkylation of hydrazones with allylicacetates has been developed for the first time. The reaction allows for the preparation of various valuable N-substituted hydrazones with generally good yields and excellent enantioselectivities. Minor structural modification of the ligand resulted in opposite enantiomers
Catalytic hydrophosphorylation of alkyl- and acylhydrazones
作者:E. D. Matveeva、T. A. Podrugina、I. N. Kolesnikova、M. V. Prisyazhnoi、G. G. Karateev、N. S. Zefirov
DOI:10.1007/s11172-010-0095-2
日期:2010.2
N-Boc- and N-acylhydrazino phosphonates were obtained for the first time by hydrophosphorylation of the appropriate hydrazones of aliphatic and aromatic aldehydes and heterocyclic and aliphatic ketones in the presence of [tetra(tert-butyl)phthalocyanine]aluminum chloride as a catalyst.
Mn(III)-mediated phosphinoylation of aldehyde hydrazones: Direct “one-pot” synthesis of α-iminophosphine oxides from aldehydes
作者:Xue-Wei Bian、Ling Zhang、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1016/j.tet.2021.132053
日期:2021.4
A “one-pot” strategy for the straightforward Mn(III)-mediated phosphinoylation of aldehyde hydrazones with diphenylphosphine oxide to furnish α-iminophosphine oxides is described. This mild and practical method allows the direct use of aldehydes as substrates in one pot to generate the hydrazones, which are then engaged “in situ” by the phosphorus reagent in the presence of Mn(OAc)3 oxidant. Thus,