Lanthanide Silylamide-Catalyzed Synthesis of Pyrano[2,3-<i>b</i>]indol-2-ones
作者:Qifa Chen、Yue Teng、Fan Xu
DOI:10.1021/acs.orglett.1c01506
日期:2021.6.18
A lanthanide silylamide-catalyzed tandem reaction of isatins, diethyl phosphite, and 2,3-diarylcyclopropenones has been developed. A series of pyrano[2,3-b]indol-2-ones were synthesized in high yields. The cooperation of the Lewis acidity of the lanthanide center and the Bronsted basicity of the N(SiMe3)2 anion may be the key factor affecting the catalytic activity of lanthanide amides.
已经开发了镧系元素甲硅烷基酰胺催化的靛红、亚磷酸二乙酯和 2,3-二芳基环丙烯酮的串联反应。以高产率合成了一系列吡喃并[2,3 - b ]indol-2-ones。镧系元素中心的路易斯酸度和N(SiMe 3 ) 2阴离子的布朗斯台德碱度的协同作用可能是影响镧系酰胺催化活性的关键因素。
A simple and efficient synthesis of imidazoquinoxalines and spiroquinoxalinones via pictect-spengler reaction using Wang resin
Abstract An efficient approach for the synthesis of various imidazoquinoxalines and spiroquinoxalinones has been reported from 2-(1H-imidazol-1-yl) aniline and different aldehydes using Wang-OSO3H as a reusable catalyst to get in good yields. The reaction condition has been optimized by screening in various solvents and a gram scale experiment has also demonstrated. Further, the substrate scope of
摘要 已经报道了一种有效的合成各种咪唑喹喔啉和螺喹喔啉酮的方法,该方法使用 Wang-OSO 3 H 作为可重复使用的催化剂,从 2-(1 H -imidazol -1-yl) 苯胺和不同的醛中获得了良好的收率。通过在各种溶剂中筛选优化了反应条件,并且还进行了克级实验。此外,反应的底物范围也得到了很好的证明。
The present invention relates to novel oxazolidinones derivatives of oxindoles of formula I or a pharmaceutically acceptable salt thereof wherein: Y
1
is CH or CF; R
1
is —C
1-4
alkyl, optionally substituted with a fluoro atom, or R
1
is —C
3-5
cycloalkyl; and R
2
is —C
1-2
alkyl. These compounds are useful as antibacterial agents.
A condition-tuned unorthodox approach to indole-3-carboxylic acids and anthranilic acids <i>via</i> carbon atom translocation
作者:Arup Bhowmik、Koushik Naskar、Shantonu Roy、Sudip Karmakar、Writhabrata Sarkar、Imtiaj Mondal、Arindam Sana、Indubhusan Deb
DOI:10.1039/d3cc04443b
日期:——
one-pot cascade method for the synthesis of indole-3-carboxylic acids using isatins and DMSO via a one-carbon translocation involving in situ generation of α,β-unsaturated methylvinylsulfoxide followed by amide bond cleavage and ring closure. The methodology has been extended to afford anthranilicacid derivatives by tuning the reaction conditions in the presence of molecular oxygen. Importantly, easy