One-pot cascade ring enlargement of isatin-3-oximes to 2,4-dichloroquinazolines mediated by bis(trichloromethyl)carbonate and triarylphosphine oxide
作者:Jinjing Qin、Zhenhua Li、Shengzhe Ma、Lixian Ye、Guoqiang Jin、Weike Su
DOI:10.1080/10426507.2020.1782910
日期:2020.12.1
Abstract An efficient and convenient one-pot cascade synthesis of 2,4-dichloroquinazolines directly from isatin-3-oximes with the addition of bis(trichloromethyl)carbonate and triarylphosphine oxide was developed, leading to substituted quinazolines in moderate to excellent yields. The efficiency of this transformation was demonstrated by compatibility with a range of functional groups. Thus, the method
method for the synthesis of isatin oximes was developed through the radical coupling reactions of oxindoles with t-BuONO. This protocol provides a practical and environmentally benign method for the construction of C–N bonds in water at room temperature without using any other reagents. The advantages of this strategy are its mild reaction conditions and clean procedure.
Hydropyrrolo[2,3-b]indole is a privileged indoline motif, while its analogue, hydropyrrolo[3,2-b]indole, has been much less explored. Herein, we developed a cascade reaction of oxindole-derived nitrones with allenoates, providing straightforward access to the tetracyclic hydropyrrolo[3,2-b]indole scaffolds. Formation of multiple C–C/C–X bonds and cleavage could be achieved within one synthetic step
Hydropyrrolo[2,3- b ]indole 是一种特殊的二氢吲哚基序,而其类似物 hydropyrrolo[3,2- b ]indole 则鲜为人知。在此,我们开发了羟吲哚衍生的硝酮与联烯酸酯的级联反应,提供了四环氢吡咯并 [3,2- b ] 吲哚支架的直接途径。多个 C-C/C-X 键的形成和裂解可以在温和条件下使用一种简单的催化剂 (Gimeracil) 在一个合成步骤中实现。反应途径可能涉及作为关键中间体的螺氢氮杂酮的产生。
Combination of Hydrogen and Halogen Bonds in the Crystal Structures of 5-Halogeno-1H-isatin-3-oximes: Involvement of the Oxime Functionality in Halogen Bonding
作者:Eric Meier、Wilhelm Seichter、Monika Mazik
DOI:10.3390/molecules29051174
日期:——
focus on the analysis of the hydrogen and halogen bond preferences observed in the crystalstructures of 5-halogeno-1H-isatin-3-oximes. These molecules can be involved in various non-covalent interactions, and the competition between these interactions has a decisive influence on their self-organization. In particular, we were interested to see whether the crystalstructures of 5-halogeno-1H-isatin-3-oximes