Sequential Formal [4+1]‐Cycloaddition, C−H Functionalization and Suzuki–Miyaura Cross‐Coupling for the Synthesis of Trisubstituted Isoxazolines
作者:Pavel Yu. Ushakov、Alexey Yu. Sukhorukov、Sema L. Ioffe、Andrey A. Tabolin
DOI:10.1002/ejoc.202100313
日期:2021.5.14
Efficient sequential [4+1]‐annulation, C−H functionalization, and Suzuki–Miyaura cross‐coupling is reported as diastereoselective route to trisubstituted isoxazolines – convenient building blocks for organic synthesis.
A facile and new metal-free 1,3-dipolarcycloaddition reaction for the synthesis of 4-aryl-NH-1,2,3-triazoles from nitroolefins and NaN3 employing NH2SO3H has been developed. Sulfamic acid proved to be an efficient additive in this transformation by inhibiting the formation of triaryl benzene. Mechanistic aspects and key intermediates associated with this transformation have also been characterized
UV absorbing monomers that are particularly useful in ophthalmic devices are disclosed.
披露了在眼科设备中特别有用的吸收紫外线的单体。
Naturally occurring compounds related to phenalenone. Part VI. Synthesis of atrovenetin (8,9-dihydro-3,4,5,6-tetrahydroxy-1,8,8,9-tetra-methylphenaleno[1,2-b]furan-7-one) and related compounds
作者:David A. Frost、George A. Morrison
DOI:10.1039/p19730002388
日期:——
A synthesis of (±)-atrovenetin (19b) in ten steps from 3,4,5-trimethoxybenzaldehyde (5c) is described. A number of related phenalenone derivatives, including norxanthoherquein (2,3,4,7,8,9-hexahydroxy-6-methylphenalen-1-one)(27), one of the principal degradation products of norherqueinone (2), have also been synthesised.
Aminobromination of β-Nitrostyrene Derivatives with N,N-Dibromourethane as the Aminobrominating Reagent
作者:Zhan-Guo Chen、Peng-Fei Zhao、Yun Wang
DOI:10.1002/ejoc.201100751
日期:2011.10
A concise and efficient aminobromination reaction for β-nitrostyrenederivatives by treatment with N,N-dibromourethane was developed. For the β-nitrostyrenederivatives, the aminobromination successfully proceeded at room temperature in CH3CN without catalysis or protection by an inert gas and gave products in excellent yields (80–97 %). For the β-methyl analogs, the reaction proceeded smoothly with