Gold and Palladium Combined for the Sonogashira Coupling of Aryl and Heteroaryl Halides
作者:Tarun Sarkar、Biswajit Panda
DOI:10.1055/s-0032-1318119
日期:——
transmetalation step. A highly efficient gold and palladium combined methodology for the Sonogashiracoupling of a wide array of electronically and structurally diverse aryl and heteroaryl halides is described. The orthogonal reactivity of the two metals shows high selectivity and extreme functional group tolerance in Sonogashiracoupling. A brief mechanistic study reveals that the gold acetylide intermediate enters
Conformational Control and Photoenolization of Pyridine-3-carboxaldehydes in the Solid State: Stabilization of Photoenols via Hydrogen Bonding and Electronic Control
intramolecular hydrogen bonding could be utilized to achieve conformational control. In contrast to mesitaldehydes, which undergo efficient photocyclization to benzocyclobutenols in the solid state, the heteroatom analogues 1b and 1c exhibit a perceptible color change (from colorless to pale yellow for 1b and yellow-orange for 1c) upon UV irradiation; the color attributed to (E)-enols is persistent for
作者:Nadezhda S. Baleeva、Alexander Yu. Smirnov、Elvira R. Zaitseva、Dmitrii S. Ivanov、Anatolii I. Sokolov、Andrey A. Mikhaylov、Ivan N Myasnyanko、Mikhail S. Baranov
DOI:10.1039/d3nj01837g
日期:——
ortho-Dialkylaminoarylidene malonates undergo hydrogen transfer mediated cyclization in the absence of a catalyst under LED irradiation. This activation mode is found to be relatively general and could be applied to a number of other acceptor motifs in the arylidene substrates tested. Variation of the light source wavelength opens an extra option for fine tuning of the reaction conditions, making the
邻二烷基氨基亚芳基丙二酸酯在没有催化剂的情况下在 LED 照射下经历氢转移介导的环化。发现这种激活模式相对通用,并且可以应用于测试的亚芳基底物中的许多其他受体基序。光源波长的变化为反应条件的微调提供了额外的选择,使得所描述的方法几乎通用。