Ultrasound promoted mild and facile one-pot, three component synthesis of 2H-indazoles by consecutive condensation, C N and N N bond formations catalysed by copper-doped silica cuprous sulphate (CDSCS) as an efficient heterogeneous nano-catalyst
作者:Mohammad Navid Soltani Rad
DOI:10.1016/j.ultsonch.2016.07.026
日期:2017.1
An ultrasonic promoted facile and convenient one-pot three-component procedure for the synthesis of 2H-indazole derivatives using copper-doped silica cuprous sulphate (CDSCS) as a heterogeneous nano-catalyst has been described. In this approach, ultrasonic mediated reaction of different substituted 2-bromobenzaldehydes, structurally diverse primary amines, and tetrabutylammonium azide (TBAA) as an
Reduction of nitro- and nitroso-compounds by tervalent phosphorus reagents. Part XI. A kinetic study of the effects of varying the reagent and the nitro-compound in the conversion of o-nitrobenzylideneamines to 2-substituted indazoles
作者:Margaret-Ann Armour、J. I. G. Cadogan、David S. B. Grace
DOI:10.1039/p29750001185
日期:——
A kinetic study of the effects of varying the phosphorus reagent and substituents in the nitro-compound in the reductivecyclisation of o-nitrobenzylideneamines to 2-substituted indazoles has been made. First-order rate constants vary from 8.2 to 52.2 × 10–5 s–1 for the triethyl phosphite-induced reduction of N-o-nitrobenzylideneanilines [o-NO2C6H4CHNC6H4Y; Y =p-MeO, p-Me, H, p-CI, p-Br, p-CO2Et, p-CN
动力学研究了在邻硝基亚苄基胺还原成2-取代的吲唑的环化反应中改变硝基化合物中磷试剂和取代基的作用。一级速率常数从8.2变化至52.2×10 -5小号-1为的亚磷酸三乙酯诱导的减少ñ - ö -nitrobenzylideneanilines [ ø -NO 2 ç 6 ħ 4 CH NC 6 H ^ 4 ÿ; Y = p -MeO,p -Me,H,p -Cl,p -Br,p -CO 2等等,p -CN。p -NO 2,或ö ] -CI和Ñ -5-氯-2- nitrobenzylideneaniline,并略有不同的5至6×10 -5小号-1为ö -nitrobenzylideneamines [ ø -NO 2 ·C 6 H ^ 4 · CH NR; R = Me中,乙基,丙基我,或卜Ñ ]。这些反应的产物是相应的2-芳基-(芳基= C 6 H 4 Y)和2-烷基-(烷基= R)-吲唑。这
A Biphilic Phosphetane Catalyzes N–N Bond-Forming Cadogan Heterocyclization via P<sup>III</sup>/P<sup>V</sup>═O Redox Cycling
作者:Trevor V. Nykaza、Tyler S. Harrison、Avipsa Ghosh、Rachel A. Putnik、Alexander T. Radosevich
DOI:10.1021/jacs.7b03260
日期:2017.5.24
chemoselective catalytic synthesis of 2H-indazoles, 2H-benzotriazoles, and related fused heterocyclic systems with good functional group compatibility. On the basis of both stoichiometric and catalytic mechanistic experiments, the reaction is proposed to proceed via catalytic PIII/PV═O cycling, where DFT modeling suggests a turnover-limiting (3+1) cheletropic addition between the phosphetane catalyst and nitroarene
Iron-Catalyzed Reductive Coupling of Nitroarenes with Olefins: Intermediate of Iron–Nitroso Complex
作者:Heng Song、Zhuoyi Yang、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/acscatal.9b03604
日期:2020.1.3
Using a single half-sandwich iron(II) compound, Cp*Fe(1,2-Ph2PC6H4S)(NCMe) (Cp*– = C5Me5–, 1) as a catalyst, reductivecoupling of nitroarenes with olefins has been achieved by a well-defined iron(II)/(EtO)3SiH system. Through either inter- or intramolecular reductivecoupling, various branched amines and indole derivatives have been directly synthesized in one-pot. Mechanistic studies showed that
使用单一的半夹心铁(II)化合物作为催化剂,将Cp * Fe(1,2-Ph 2 PC 6 H 4 S)(NCMe)(Cp * – = C 5 Me 5 –,1)作为催化剂,进行还原偶联明确定义的铁(II)/(EtO)3 SiH体系可实现硝基芳烃与烯烃的合成。通过分子间或分子内的还原偶联,已经在一锅中直接合成了各种支链胺和吲哚衍生物。机理研究表明,催化作用是由铁(II)催化剂与硅烷活化硝基芳烃而引发的,从而生成用于C-N键偶联的铁-亚硝基芳烃中间体。
Highly Efficient One‐Pot Three Component Synthesis of 2
<i>H</i>
‐Indazoles by Consecutive Condensation, C–N and N–N Bond Formations Using Cu/Aminoclay/Reduced Graphene Oxide Nanohybrid
作者:Somayeh Behrouz
DOI:10.1002/jhet.2777
日期:2017.5
nanohybrid (Cu/AC/r‐GO nanohybrid) as an efficient heterogeneous catalyst affords the corresponding 2H‐indazoles in good to excellent yields. The influence of effective parameters on the efficient progress of the reaction was studied. The Cu/AC/r‐GO nanohybrid is a stable and inexpensive catalyst that could be simply prepared, recovered, and reused for several reaction runs with no significant decrease in
本文描述了在无配体条件下通过铜催化的连续缩合反应,容易获得的起始原料的C–N和N–N键形成简单,直接的一锅三组分2 H-吲唑合成方法。在该方案中,在存在铜/氨基粘土/还原氧化石墨烯纳米杂化物(Cu / AC / r-GO纳米杂化物)作为高效多相催化剂的情况下处理取代的2-溴苯甲醛,结构不同的胺和[bmim] N 3对应2 H吲唑类化合物的收率为好至极好。研究了有效参数对反应有效进行的影响。Cu / AC / r-GO纳米杂化物是一种稳定且便宜的催化剂,可以简单地制备,回收并重新用于多个反应过程,而不会显着降低其反应活性。