The synthesis and electronic absorption spectra of 3-phenyl-3(4-pyrrolidino-2-substituted phenyl)-3H-naphtho[2,1-b]pyrans: further exploration of the ortho substituent effect
摘要:
Introduction of a substituent into a sterically demanding 2-position of a 3-(4-pyrrolidinophenyl) ring of a 3,3-diaryl-3H-naphtho[2,1-b]pyran results in the generation of an additional short wavelength absorption band leading to organic photochromes that appear as dull shades of orange and red. (c) 2005 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Carbonylative Annulation Reactions Using Aryl Formate as a CO Source: Synthesis of 2-Substituted Indene-1,3(2<i>H</i>)-dione Derivatives
作者:Ying Zhang、Jing-Lei Chen、Zhen-Bang Chen、Yong-Ming Zhu、Shun-Jun Ji
DOI:10.1021/acs.joc.5b01758
日期:2015.11.6
An efficient synthesis of 2-substituted indene-1,3(2H)-diones from stable and readily available 1-(2-halophenyl)-1,3-diones by employing phenyl formate as a CO source has been developed. The reaction occurred via palladium-catalyzed intramolecular carbonylative annulation using K3PO4 as a base and DMSO as a solvent at 95 °C. In this protocol, the reaction showed a broad substrate scope with good to
已经开发了通过使用甲酸苯酯作为CO源从稳定且容易获得的1-(2-卤代苯基)-1,3-二酮有效合成2-取代的茚-1,3(2 H)-二酮的方法。该反应通过在95°C下使用K 3 PO 4为碱和DMSO作为溶剂的钯催化的分子内羰基环化反应进行。在该方案中,反应显示出广泛的底物范围,具有良好或优异的产率。
N-Substituted 2-iodobenzamides and enaminones undergo cascade transformations to achieve quinazolinones via a copper-catalyzed Ullmann-type coupling, a Michael addition and a retro-Mannich reaction. A unique stereochemical feature of this domino process was that Z-enaminones reacted without external ligands, whereas E-enaminones required the assistance of ligands.
作者:Austin D. Marchese、Louise Kersting、Mark Lautens
DOI:10.1021/acs.orglett.9b02797
日期:2019.9.6
A scalable, diastereoselective nickel-catalyzed carboiodination reaction is reported that avoids metal-based reducing agents. Novel anti-dihydroquinolones and previously unreported tetrahydroquinolines are now readily prepared. The generation of anti-dihydroquinolones is noteworthy, as this selectivity is opposite to that of the Pd variant. Mechanistic insight into the nature of the nickel-catalyzed
The copper-catalyzed multicomponentreaction of 2-iodobenzamides, NaN3 and terminal alkynes for the synthesis of 2-(1,2,3,-triazolyl)benzamide derivatives was achieved in a one-step process and short period of time under mild reaction condition. The transformations consisted of C(aryl)-N bond formation and azide-alkyne cycloadditon. The absence of an external base was found to be crucial in determining