Nickel Pincer Complexes Catalyzed Sustainable Synthesis of 3,4-Dihydro-2<i>H</i>-1,2,4-benzothiadiazine-1,1-dioxides via Acceptorless Dehydrogenative Coupling of Primary Alcohols
作者:Anandaraj Pennamuthiriyan、Ramesh Rengan
DOI:10.1021/acs.joc.3c02508
日期:2024.2.16
(DHBD) derivatives from readily available aromatic primary alcohols and 2-aminobenzenesulfonamide catalyzed by nickel(II)-N∧N∧S pincer-type complexes. The synthesized nickel complexes have been well-studied by elemental and spectroscopic (FT-IR, NMR, and HRMS) analyses. The solid-state molecular structure of complex 2 has been authenticated by a single-crystal X-ray diffraction study. Furthermore, a series
我们报道了由容易获得的芳香伯醇和 2-氨基苯磺酰胺催化的原子经济且可持续的合成具有生物学重要意义的 3,4-二氢-2 H -1,2,4-苯并噻二嗪-1,1-二氧化物 (DHBD) 衍生物镍(II)-N∧N∧S钳型配合物。合成的镍配合物已通过元素和光谱(FT-IR、NMR 和 HRMS)分析进行了深入研究。配合物2的固态分子结构已通过单晶X射线衍射研究得到验证。此外,利用 3 mol% Ni(II) 催化剂,通过无受体脱氢偶联,合成了一系列 3,4-二氢-2 H -1,2,4-苯并噻二嗪-1,1-二氧化物衍生物(24 个实例)苯甲醇与苯磺酰胺。令人欣慰的是,该催化方案具有高度选择性,收率高达 93%,并产生环保的水/氢气作为副产品。对照实验和合理的机理研究表明,原位生成的醛与苯磺酰胺的偶联产生了所需的产物。此外,一种噻二嗪衍生物的大规模合成揭示了当前方法的合成用途。
Green Approach Toward One Pot Cascade Synthesis of 3-Aryl-3,4-Dihydro-1,2,4 Benzothiadiazine-1,1-Dioxides
A silica-gel-supported ceric ammonium nitrate (CAN-SiO2) was found to be an effective catalyst for the cascade synthesis of functionalized 3-aryl-3,4-dihydro-1,2,4-benzo- thiadiazine-1,1-dioxides using 2-aminobenzenesulfonamide and benzaldehydes at room temperature. The reaction allows rapid cyclization (10-70min) with 5mol% CAN impregnated on silica gel to give the desired products in excellent yield without further column purification. The protocol uses inexpensive and environmentally friendly CAN-SiO(2)as the catalyst, and no ligand or additive was required. [Supplementary materials are available for this article. Go to the publisher's online edition ofPhosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional figures]
Rhodium-Catalyzed Annulations and Heck Coupling/Aza-Michael Addition for the Synthesis of Benzothiadiazinoisoquinoline 6,6-Dioxides and Benzothiadiazinoisoindole 5,5-Dioxides, Respectively
作者:Subramani Kumaran、Kanniyappan Parthasarathy
DOI:10.1021/acs.joc.2c00964
日期:2022.9.16
benzothiadiazinoisoquinoline 6,6-dioxides and benzothiadiazinoisoindole 5,5-dioxides in good to excellent yields. These compounds are formed through a sequential Rh(III)-catalyzed C–H cyclization of dihydrophenylbenzothiadiazine 1,1-dioxides with alkynes and oxidative Heck coupling/aza-Michael addition of dihydrophenylbenzothiadiazine 1,1-dioxides with acrylates, respectively.