functional group tolerant cobalt-catalyzed method for the intermolecular hydrofunctionalization of alkenes with oxygen- and nitrogen-based nucleophiles is reported. This protocol features a strategic use of hypervalent iodine(III) reagents that enables a mechanistic shift from conventional cobalt-hydride catalysis. Key evidence was found supporting a unique bimetallic-mediated rate-limiting step involving
Iron-Catalyzed Acyloxyalkylation of Styrenes Using Hypervalent Iodine Reagents
作者:Zijia Wang、Motomu Kanai、Yoichiro Kuninobu
DOI:10.1021/acs.orglett.7b00923
日期:2017.5.5
Iron-catalyzed acyloxyalkylation of styrene derivatives usinghypervalentiodinereagents was achieved. The acyloxyalkylation reaction proceeded using various types of styrenes and hypervalentiodinereagents. The acyloxyalkylated products were obtained in moderate to good yields without loss of the functional groups. The reaction proceeded via the formation of radical species derived from hypervalent
A Synergic Blend of Newly Isolated Pseudomonas mandelii KJLPB5 and [hmim]Br for Chemoselective 2° Aryl Alcohol Oxidation in H2O2: Synthesis of Aryl Ketone or Aldehydes via Sequential Dehydration-Oxidative C=C Cleavage
作者:Nandini Sharma、Upendra K. Sharma、Richa Salwan、Ramesh C. Kasana、Arun K. Sinha
DOI:10.1007/s10562-010-0542-6
日期:2011.4
KJLPB5 is reported for the oxidation of aryl alcohols in ionic liquid [hmim]Br (1-hexyl-3-methyl imidazolium bromide) with H2O2. With a slight alteration of reaction conditions, the developed protocol leads either to (i) chemoselectiveoxidation of 2° aryl alcohols over 1° and aliphatic counterparts or (ii) direct one pot-two step sequential conversion of 2° aryl alcohols into corresponding one or two
The chemistry of acylals. Part I. The reactivity of acylals towards Grignard and organolithium reagents
作者:Leiv K. Sydnes、Marcel Sandberg
DOI:10.1016/s0040-4020(97)00789-8
日期:1997.9
been prepared and reacted with Grignard and alkyllithium reagents. Acylals from formaldehyde furnished complex reaction mixtures when reacted with both reagents. Acylals of other aldehydes gave reaction mixtures that consisted mainly of an ester, generated by replacing one of the carboxy groups with the organic part of the organometallic reagent, and regenerated aldehyde. The esters were formed in the
Here we disclose a general Co(II/III/IV) electrocatalytic platform for alkene functionalization. Driven by electricity, a set of the oxidative hydrofunctionalization reactions via hydrogen atom transfer were demonstrated without the need for stochiometric chemical oxidants. The scope of the reactions encompasses hydroalkoxylation, hydroacyloxylation, hydroarylation, semipinacol rearrangement, and deallylation