Catalytic Carbo- and Aminoboration of Alkenyl Carbonyl Compounds via Five- and Six-Membered Palladacycles
作者:Zhen Liu、Hui-Qi Ni、Tian Zeng、Keary M. Engle
DOI:10.1021/jacs.8b00881
日期:2018.3.7
A palladium(II)-catalyzed alkene difunctionalization reaction has been developed, wherein B2pin2 is used to trap chelation-stabilized alkylpalladium(II) intermediates that are formed upon nucleopalladation. A range of carbon and nitrogennucleophiles were found to be suitable coupling partners in this transformation, providing moderate to high yields. Both 3-butenoic and 4-pentenoic acid derivatives
已开发出钯 (II) 催化的烯烃双官能化反应,其中 B2pin2 用于捕获在核钯化时形成的螯合稳定的烷基钯 (II) 中间体。发现一系列碳和氮亲核试剂是该转化中合适的偶联伙伴,可提供中等至高产率。3-丁烯酸和4-戊烯酸衍生物都是反应性底物类别,提供β,γ-和γ,δ-双官能化羧酸衍生物。这项工作代表了一种合成高度功能化二级硼酸盐的新策略,可以补充现有方法。
A Chiral Electrophilic Selenium Catalyst for Highly Enantioselective Oxidative Cyclization
作者:Yu Kawamata、Takuya Hashimoto、Keiji Maruoka
DOI:10.1021/jacs.6b01462
日期:2016.4.27
Chiral electrophilic selenium catalysts have been applied to catalytic asymmetric transformations of alkenes over the past two decades. However, highlyenantioselective reactions with a broad substrate scope have not yet been developed. We report the first successful example of this reaction employing a catalyst based on a rigid indanol scaffold, which can be easily synthesized from a commercially
A butenoic or propenoic acid derivative having the following formula in which G is an aryl or a heterocyclic ring, R11 and R12 are hydroben or an alkyl, X is sulfur or oxygen, R2 and R3 are hydrogen, an substituent such as an alkyl and J is pyridyl or phenyl having substituents and a heterocyclic ring may be formed between R2, R3 and J is provided here and is useful in the pharmacological field.