以4Na 2 SO 4 ·2H 2 O 2 ·NaCl为还原剂,成功制备了比表面积大,混合价高的氧化锰八面体分子筛(OMS-2)。OMS-2对由苄醇和苯甲idine有氧氧化合成1,3,5-三嗪具有极好的催化能力。甲基苯,DMF和DMSO也可以用作底物,与苯甲idine在异质条件下反应生成三嗪。该催化系统具有无碱条件,广泛的底物范围,高化学选择性,操作简便,催化剂可回收性以及O 2作为绿色氧化剂的利用。
iEDDA Reaction of the Molecular Iodine-Catalyzed Synthesis of 1,3,5-Triazines via Functionalization of the sp<sup>3</sup> C–H Bond of Acetophenones with Amidines: An Experimental Investigation and DFT Study
作者:Abhishek R. Tiwari、Shilpa R. Nath、Kaustubh A. Joshi、Bhalchandra M. Bhanage
DOI:10.1021/acs.joc.7b02313
日期:2017.12.15
Diels–Alder (iEDDA)-type reaction to synthesize 1,3,5-trizines from acetophenones and amidines. The use of molecular iodine in a catalytic amount facilitates the functionalization of the sp3 C–H bond of acetophenones. This is a simple and efficient methodology for the synthesis of 1,3,5-triazines in good to excellent yields under transition-metal-free and peroxide-free conditions. The reaction is believed to
Iridium-catalyzed cascade dehydrogenation, ring-closure reaction leading to 2,4,6-triaryl-1,3,5-triazines
作者:Gang Shi、Fei He、Youxin Che、Caihua Ni、Ying Li
DOI:10.1134/s1070363216020304
日期:2016.2
An efficient iridium-catalyzed dehydrogenation, ring-closurereaction, has been developed via a cascade sequence, in which [Cp*IrI2]2/Xantphos proved to be the most efficient catalyst for the synthesis of 2,4,6-triaryl-1,3,5-triazines from stable aryl-substituted alcohols and amidines. It was the first case of iridium catalyst successful application in such transformation.
通过级联序列开发了一种有效的铱催化的脱氢,闭环反应,其中[Cp * IrI 2 ] 2 / Xantphos被证明是合成2,4,6-三芳基-的最有效催化剂。来自稳定的芳基取代的醇和am的1,3,5-三嗪 这是铱催化剂成功应用于此类转化的第一种情况。
NIS-catalyzed oxidative cyclization of alcohols with amidines: a simple and efficient transition-metal free method for the synthesis of 1,3,5-triazines
作者:Abhishek R. Tiwari、Akash T.、Bhalchandra M. Bhanage
DOI:10.1039/c5ob01835h
日期:——
An efficient method for the synthesis of 1,3,5-triazines by NIS-catalyzed oxidative cyclization of alcohols with amidines has been developed. The reaction works smoothly under transition-metal free and phosphine-free conditions to afford a wide range of 1,3,5-triazine derivatives in moderate to good yields. The synthetic methodology was achieved via in situ oxidation of alcohols to aldehydes.
By using [RuCl2(p-Cymene)]2/Cs2CO3 as an efficient catalyst system, the readily available, inexpensive aryl methanols were firstly employed for dehydrogenative synthesis of aryl substituted 1,3,5-triazine derivatives. Due to the inherent stability of alcohols in contrast with aldehydes, our synthetic protocol is adaptable to a broad substrate scope, there is no need for stringent protection during
通过使用[RuCl 2(对-Cymene)] 2 / Cs 2 CO 3作为有效的催化剂体系,首先将容易获得的廉价芳基甲醇用于芳基取代的1,3,5-三嗪衍生物的脱氢合成。由于醇与醛相比具有固有的稳定性,因此我们的合成方案适用于广泛的底物范围,在整个操作过程中都不需要严格的保护,并且有可能制备目前难以获得或无法获得的有价值的产品使用常规方法进行准备具有挑战性。这是对常规合成方法的重要补充。
Polythene glycol (PEG) as a reusable solvent system for the synthesis of 1,3,5-triazines via aerobic oxidative tandem cyclization of benzylamines and N-substituted benzylamines with amidines under transition metal-free conditions
作者:Abhishek R. Tiwari、Bhalchandra M. Bhanage
DOI:10.1039/c5gc01884f
日期:——
A green and highly efficient protocol for the syntheis of 1,3,5-triazines from benzylamines and N-substitutedbenzylamines amidines in PEG-600 has been developed firstly. This protocol is transition-metal free, phosphine ligand...