An efficient one-pot palladium-catalyzed hydroformylation of aryl halides to produce aromatic aldehydes has been achieved, employing tert-butyl isocyanide as a C1 resource and formate salt as a hydride donor without any additional bases. Characterized by its mild reaction conditions, easy operation and lower toxicity, this reaction can tolerate a wide array of functional groups with moderate to excellent
Structure–Reactivity Relationship in the Frustrated Lewis Pair (FLP)‐Catalyzed Hydrogenation of Imines
作者:Sebastian Tussing、Karl Kaupmees、Jan Paradies
DOI:10.1002/chem.201600716
日期:2016.5.23
The autoinduced, frustratedLewispair (FLP)‐catalyzed hydrogenation of 16‐benzene‐ring substituted N‐benzylidene‐tert‐butylamines with B(2,6‐F2C6H3)3 and molecular hydrogen was investigated by kinetic analysis. The pKa values for imines and for the corresponding amines were determined by quantum‐mechanical methods and provided a direct proportional relationship. The correlation of the two rate constants
的autoinduced,沮丧路易斯对(FLP)16 -苯环的催化的加氢取代Ñ -benzylidene-叔-butylamines与B(2,6-F 2 C ^ 6 ħ 3)3和分子氢是由动力学分析调查。亚胺和相应胺的p K a值是通过量子力学方法确定的,并提供了直接的比例关系。两个速率常数k 1(简单的催化循环)和k 2(自动诱导的催化循环)与p K的相关性亚胺和胺对之间的差异(ΔpK a)或Hammett的σ参数用作建立FLP催化的亚胺加氢反应的结构反应性关系的有用参数。
Remarkably Efficient Iridium Catalysts for Directed C(sp<sup>2</sup>)–H and C(sp<sup>3</sup>)–H Borylation of Diverse Classes of Substrates
aliphatic substrates for selective C(sp3)–H bond borylations. Heterocyclic molecules are selectively borylated using the inherently elevated reactivity of the C–H bonds. A number of late-stage C–H functionalization have been described using the same catalysts. Furthermore, we show that one of the catalysts could be used even in open air for the C(sp2)–H and C(sp3)–Hborylations enabling the method more general
Transient Imine as a Directing Group for the Metal-Free <i>o</i>-C–H Borylation of Benzaldehydes
作者:Supriya Rej、Naoto Chatani
DOI:10.1021/jacs.0c13013
日期:2021.2.24
simple metal-free approach, utilizing an imine transient directinggroup. The strategy covers a wide spectrum of reactions and (i) even highly sterically hindered C–H bonds can be borylated smoothly, (ii) despite the presence of other potential directinggroups, the reaction selectively occurs at the o-C–H bond of the benzaldehyde moiety, and (iii) natural products appended to benzaldehyde derivatives can
Synthesis of Dihydrobenzisoxazoles by the [3 + 2] Cycloaddition of Arynes and Oxaziridines
作者:Arif Kivrak、Richard C. Larock
DOI:10.1021/jo101656c
日期:2010.11.5
unusual cleavage of the C−O bond of the oxaziridine and tolerates a variety of substituents on the oxaziridine and the o-(trimethylsilyl)aryl triflate to form aryl-, heteroaryl-, alkyl-, and naphthyl-substituted dihydrobenzisoxazoles. The resulting halogen-substituted dihydrobenzisoxazoles are readily elaborated to more complex products using palladium-catalyzed crossing-coupling processes.