Reductive heterocyclizations via indium–iodine-promoted conversion of 2-nitroaryl imines or 2-nitroarenes to 2,3-diaryl-substituted indazoles
作者:Gil Hwan Ahn、Jung June Lee、Young Moo Jun、Byung Min Lee、Byeong Hyo Kim
DOI:10.1039/b707240f
日期:——
N-(2-nitrobenzylidene)anilines produced mixtures of 2,1-benzisoxazoles and 3-anilino-2-aryl-2H-indazoles in the presence of indium and iodine in MeOH, N-(2-nitrobenzylidene)anilines were transformed into 3-anilino-2-aryl-2H-indazoles as the predominant major product through the change of the solvent from protic MeOH to aprotic THF. In an indium-mediated one-pot reductive reaction, 2-benzaldehydes and anilines in THF
Fast and Efficient Synthesis of Pyrano[3,2-<i>c</i>]quinolines Catalyzed by Niobium(V) Chloride
作者:Mauricio Constantino、Luiz da Silva-Filho、Valdemar Lacerda Júnior、Gil da Silva
DOI:10.1055/s-2008-1067186
日期:2008.8
A highly efficient two-step method for the synthesis of pyranoquinoline derivatives from imino-Diels-Alder reactions between aldimines and 3,4-dihydro-2H-pyran using niobium(V) chloride as catalyst under mild conditions is described.
Acceptorless dehydrogenative construction of CN and CC bonds through catalytic aza-Wittig and Wittig reactions in the presence of an air-stable ruthenium pincer complex
aza-Wittig typereaction. The reaction is catalyzed by an acridine-derived ruthenium pincer complex and does not use any oxidant. The present protocol offers a wide substrate scope, including aliphatic, aryl or heteroaryl alcohol/azides. This expeditious protocol was successfully applied to construct a CC bond directly from alcohol via dehydrogenative Wittigreaction. Furthermore, the synthesis of structurally
C N键的构建是通过aza-Wittig型反应将醇与叠氮化物进行脱氢偶联而实现的。该反应由an啶衍生的钌钳配合物催化,并且不使用任何氧化剂。本协议提供了广泛的底物范围,包括脂族,芳基或杂芳基醇/叠氮化物。该快速方案已成功应用于通过脱氢Wittig反应直接从醇中构建C C键。此外,通过该方法还可以合成结构上重要的吡咯并[1,4]苯并二氮杂衍生物。
An Efficient and Convenient Synthesis of Ethyl 1-(4-Methoxyphenyl)-5-phenyl-1<i>H</i>-1,2,3-triazole-4-carboxylate
作者:Jung-Hsuan Chen、Shuan-Ru Liu、Kwunmin Chen
DOI:10.1002/asia.200900320
日期:2010.2.1
The “click chemistry” of using organic azides and terminal alkynes is arguably the most efficient and straightforward route to the synthesis of 1,2,3‐triazoles. In this paper, an alternative and direct access to ethyl 1‐(4‐methoxyphenyl)‐5‐phenyl‐1H‐1,2,3‐triazole‐4‐carboxylate is described. Treatment of ethyl diazoacetate with 4‐methoxyaniline derived aryl imines in the presence of 1,8‐diazabicyclo[5
The synthesis and anti-cancer activity evaluation of fused imidazoquinoline compounds is reported in this paper. Yb(OTf)3 has been utilized as a catalyst for the synthesis of 1,4-diaryl substituted imidazo[4,5-c]quinolines via a modified Pictet–Spengler approach. The desired imidazole ring was synthesized from imines using TosMIC (toluenesulfonylmethyl isocyanide) and subsequently functionalized at
本文报道了融合的咪唑并喹啉化合物的合成及其抗癌活性。Yb(OTf)3已被用作通过改良的Pictet-Spengler方法合成1,4-二芳基取代的咪唑并[4,5- c ]喹啉的催化剂。使用TosMIC(甲苯磺酰基甲基异氰酸酯)由亚胺合成所需的咪唑环,然后在C-4位官能化,得到咪唑并喹啉骨架。重要的是,在不进行任何预官能化的情况下进行了最后一步,从而以高收率获得了所得化合物。合成的化合物经筛选具有抗癌活性,对4-(2-溴苯基)-1-苯基-1 H-咪唑并[4,5-]具有最高的活性。c ]喹啉(IC 50:103.3μM)。