Substituted pentafluorobenzenes react with sulfur to give bis(4-substituted 2,3,5,6-tetrafluorophenyl) sulfides in the presence of RhH(PPh3)4, 1,2-bis(diphenylphosphino)benzene (dppBz), and tributylsilane. The reaction proceeds efficiently between room temperature and 80 °C. A comparative study of the reactivities of an organic trisulfide and a tetrasulfide showed notable substrate specificity. Di-tert-butyl
“Nanorust”-catalyzed Benign Oxidation of Amines for Selective Synthesis of Nitriles
作者:Rajenahally V. Jagadeesh、Henrik Junge、Matthias Beller
DOI:10.1002/cssc.201402613
日期:2015.1
Organic nitriles constitute key precursors and central intermediates in organicsynthesis. In addition, nitriles represent a versatile motif found in numerous medicinally and biologically important compounds. Generally, these nitriles are synthesized by traditional cyanation procedures using toxic cyanides. Herein, we report the selective and environmentally benign oxidative conversion of primary amines
有机腈构成有机合成中的关键前体和中心中间体。另外,腈是在许多医学和生物学上重要的化合物中发现的通用基序。通常,这些腈是使用有毒氰化物通过传统的氰化步骤合成的。本文中,我们报道了使用可重复使用的基于“纳米锈”(纳米级Fe 2 O 3)的分子氧催化剂,伯胺选择性和环境无害的氧化转化,用于合成结构多样的芳香族,脂肪族和杂环腈。
Heteroaryl substituted pyrrolo[2,3-b]pyridines and pyrrolo[2,3-b]pyrimidines as janus kinase inhibitors
申请人:Rodgers D. James
公开号:US20070135461A1
公开(公告)日:2007-06-14
The present invention provides heteroaryl substituted pyrrolo[2,3-b]pyridines and heteroaryl substituted pyrrolo[2,3-b]pyrimidines that modulate the activity of Janus kinases and are useful in the treatment of diseases related to activity of Janus kinases including, for example, immune-related diseases, skin disorders, myeloid proliferative disorders, cancer, and other diseases.
Enantioselective palladium catalysed allylic substitution. Electronic and steric effects of the ligand.
作者:Joanne V Allen、Justin F Bower、J.M.J. Williams
DOI:10.1016/s0957-4166(00)86260-6
日期:1994.10
Ligands containing an enantiomerically pure oxazoline and a sulfur-containing tether have been examined for their ability to provide asymmetric induction in palladium catalysed allylic substitution reaction. The enantioselectivity obtained was found to be highly dependent upon the stereochemistry at sulfur (for sulfoxides), and also somewhat dependent upon the nature of the aryl group attached to the
Electrooptic chromophores with large optical birefringence for applications at high speed and short wavelengths
申请人:McGinniss D. Vincent
公开号:US20060106262A1
公开(公告)日:2006-05-18
Disclosed is a series of materials, which exhibit large birefringence under the influence of an applied electric field. These materials are capable of switching this large birefringence with a characteristic time on the order of 1 microsecond or less. In addition, these materials have good optical loss at this wavelength, and are stable under irradiation. These materials are suitable for fabrication of optical devices such a variable optical attenuators, switches, and modulators that respond in these time frames or slower. These materials are also suitable for use across a wide range of wavelengths. As a second component of this invention, some of these novel materials exhibit these desired optical properties (large birefringence, low loss, stability under illumination) at wavelengths as short as about 400 nm. These materials are suitable for fabrication of optical devices operating at or about 405 nm, where conventional EO materials strongly absorb and/or quickly degrade.