Chloronitrostyrenes in the Diels-Alder Reaction<sup>1</sup>
作者:Maynard B. Neher、Eugene W. Goldberg、Richard W. Fairchild
DOI:10.1021/jo01070a522
日期:1961.12
Substrate Promiscuity of <i>ortho</i>-Naphthoquinone Catalyst: Catalytic Aerobic Amine Oxidation Protocols to Deaminative Cross-Coupling and <i>N</i>-Nitrosation
作者:Tengda Si、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acscatal.9b03442
日期:2019.10.4
been identified as versatile aerobicoxidationcatalysts. Primary amines were readily cross-coupled with primary nitroalkanes via deaminative pathway to give nitroalkene derivatives in good to excellent yields. Secondary and tertiary amines were inert to ortho-naphthoquinone catalysts; however, secondary nitroalkanes were readily converted by ortho-naphthoquinone catalysts to the corresponding nitrite
Nitronate-aryne cycloaddition as a concise route to stereochemically complex fused benzisoxazolines and amino alcohols
作者:Alexander A. Lukoyanov、Andrey A. Tabolin、Yulia V. Nelyubina、Svetlana A. Aksenova、Alexey Yu. Sukhorukov
DOI:10.1039/d3ob00235g
日期:——
The reaction of cyclic nitronates (isoxazoline N-oxides and 5,6-dihydro-4H-1,2-oxazine N-oxides) with Kobayashi's aryneprecursors affords tricyclic benzene-fused nitroso acetals as a result of [3 + 2]-cycloaddition. The process is regio- and stereoselective in most cases and produces the target cycloadducts possessing up to four contiguous stereogenic centers. These nitroso acetals were shown to be
环状硝酸酯(异恶唑啉N-氧化物和5,6-二氢-4 H -1,2-恶嗪N)的反应-氧化物)与 Kobayashi 的芳炔前体通过 [3 + 2]-环加成反应得到三环苯稠合亚硝基缩醛。在大多数情况下,该过程具有区域选择性和立体选择性,并产生具有多达四个连续立体中心的目标环加合物。通过 N-O 键的催化氢解,这些亚硝基缩醛被证明是有价值的多取代氨基二醇的方便前体。此外,质子酸的作用通过异质 N-O 键断裂和贝克曼型反应导致环状亚硝基缩醛部分异常断裂。使用这种酸介导的反应,完成了迄今为止未知的六氢苯并[4,5]异恶唑并[2,3- a ]氮杂支架的合成。