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‐mediated Selective Radical Nitration/Nitrosation of Indoles: Efficient Approach to 3‐Nitro‐ and 3‐Nitrosoindoles
作者:Adedamola Shoberu、Cheng‐Kun Li、Ze‐Kun Tao、Guo‐Yu Zhang、Jian‐Ping Zou
DOI:10.1002/adsc.201900070
日期:2019.5.14
JPZ acknowledges financial support from the National Natural Science Foundation of China (No. 21172163, 21472133), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and Key Laboratory of Organic Synthesis of Jiangsu Province (KJS1749).
The C-2 lithiation of N-Boc- and N-(phenylsulfonyl)indoles (4–7) followed by reaction with dinitrogen tetroxide at low temperature affords the corresponding 2-nitroindoles 10–13 in 63–78% yields. Deprotection of the N-Boc-2-nitroindoles (10, 11) with trifluoroacetic acid gives 2-nitroindole (3) and 3-methyl-2-nitroindole (14) in essentially quantitative yields.
Cobalt-Catalyzed C−H Nitration of Indoles by Employing a Removable Directing Group
作者:Paridhi Saxena、Manmohan Kapur
DOI:10.1002/asia.201800036
日期:2018.4.4
nitration of 3‐substituted indoles, by using the economical and non‐toxic cobalt nitrate hexahydrate [Co(NO3)2⋅6 H2O] as a catalyst and tert‐butyl nitrite (TBN) as the nitro source, is reported. This approach provides a unique methodology involving a site‐selective C−N bond formation for preparation of C‐2 substitutednitro indoles. Utilization of the tBoc as the removable directing group enhances the
温和和有效的C(SP 2)-H的3-取代的吲哚硝化,通过使用经济,无毒的六水合硝酸钴[Co(NO 3)2 ⋅ 6 H 2 O]作为催化剂,叔丁基亚硝酸盐报道了以(TBN)为硝基源。这种方法提供了一种独特的方法,该方法涉及制备C-2取代的硝基吲哚的位点选择性C-N键形成。将t Boc用作可去除的导向基团增强了该方法的合成效用。
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.