Diastereodivergency in the reactions of 3-metallated-2-methylbutanamide
摘要:
Diastereocontrolled reactions with 3-iodozinc-2-methylbutanamide were examined. When the iodozinc reagent was reacted with aromatic and alpha,beta-unsaturated aldehydes in the presence of iodotrimethylsilane, C2-C3 anti-derivatives were obtained almost exclusively. Whereas, after transmetallation to Ti(IV), the reaction with aldehydes gave C2-C3 syn-derivatives exclusively. Acylation of the zinc reagent with acid chlorides in the presence of Pd(O) catalyst gave C2-C3 syn-derivatives. (C) 1997 Elsevier Science Ltd. All rights reserved.
Diastereodivergency in the reactions of 3-metallated-2-methylbutanamide
摘要:
Diastereocontrolled reactions with 3-iodozinc-2-methylbutanamide were examined. When the iodozinc reagent was reacted with aromatic and alpha,beta-unsaturated aldehydes in the presence of iodotrimethylsilane, C2-C3 anti-derivatives were obtained almost exclusively. Whereas, after transmetallation to Ti(IV), the reaction with aldehydes gave C2-C3 syn-derivatives exclusively. Acylation of the zinc reagent with acid chlorides in the presence of Pd(O) catalyst gave C2-C3 syn-derivatives. (C) 1997 Elsevier Science Ltd. All rights reserved.
Organic Dye-Catalyzed Intermolecular Radical Coupling of α-Bromocarbonyls with Olefins: Photocatalytic Synthesis of 1,4-Ketocarbonyls Using Air as an Oxidant
作者:Soumyadeep Roy Chowdhury、Deepak Singh、Injamam Ul Hoque、Soumitra Maity
DOI:10.1021/acs.joc.0c01985
日期:2020.11.6
α-bromocarbonyls where aerial oxygen played a role of an oxidant to install the keto-oxygen functionality. This unique process is compatible with both internal and terminal olefins and tolerates a diverse array of functional groups (ketone, ester, amide, diketones, ketoester, and malonate). This process is mild and environmentally friendly and deals with greener oxidants like oxygen, affording 1,4-ketocarbonyls as
Ni-Catalyzed Mild Arylation of α-Halocarbonyl Compounds with Arylboronic Acids
作者:Chao Liu、Chuan He、Wei Shi、Mao Chen、Aiwen Lei
DOI:10.1021/ol702456z
日期:2007.12.1
simple yet powerful Ni catalyst can be used to promote direct arylations of alpha-halocarbonyl compounds, including a range of esters, amides, and ketones, with various arylboronic acids under mild conditions. The method tolerates beta-hydrogens and functional groups in the substrates and offers reactivity and selectivity profiles that are complementary to those found in the well-established Buchwald-Hartwig approach.
Organic Fungicides. II. The Preparation of Some α-Bromopropionamides