Building Heterocyclic Systems with RC(OR)2+ Carbocations in Recyclable Brønsted Acidic Ionic Liquids: Facile Synthesis of 1-Substituted 1H-1,2,3,4-Tetrazoles, Benzazoles and Other Ring Systems with CH(OEt)3 and EtC(OEt)3 in [EtNH3][NO3] and [PMIM(SO3H)][O
作者:Gopalakrishnan Aridoss、Kenneth K. Laali
DOI:10.1002/ejoc.201100128
日期:2011.5
IL-1/CH(OEt) 3 . The latter was also formed from 2-aminobenzoic acid in IL-1/CH(OEt) 3 . Mechanistic implications are addressed. The reported protocols enable rapid assembly of a host of heterocyclic systems in high yields with the added advantage of recycling and reuse of the ILs.
The sequential reactions of tetrazoles with bromoalkynes for the synthesis of (Z)-N-(2-bromo-1-vinyl)-N-arylcyanamides and 2-arylindoles
作者:Jiajun Zhang、Ling-Guo Meng、Pinhua Li、Lei Wang
DOI:10.1039/c3ra40669e
日期:——
2-Arylindoles were prepared by a sequential reaction of Ag-catalyzed α-addition–Pd-catalyzed C–H bond functionalization of tetrazoles with bromoalkynes. A stereocontrolled Ag-catalyzed α-addition reaction of tetrazoles with bromoalkynes underwent smoothly to generate (Z)-N-(2-bromo-1-vinyl)-N-arylcyanamides, which were subsequently converted into 2-arylindoles through an intramolecular cyclization by Pd-catalyzed direct C–H bond functionalizations.
通过四唑与溴炔的 Ag 催化 α-加成-Pd 催化 C-H 键官能化的顺序反应制备了 2-芳基吲哚。在 Ag 催化下,四唑与溴炔发生了立体控制的 α 加成反应,顺利生成了 (Z)-N-(2-溴-1-乙烯基)-N-芳基氰酰胺,随后通过 Pd 催化的直接 C-H 键官能化反应将其分子内环化为 2-芳基吲哚。
A Stereocontrolled 1,2-Addition Reaction of Tetrazoles with Alkyl Propiolates for the Synthesis of Highly Functionalized Enamines
作者:Kai Luo、Lingguo Meng、Yicheng Zhang、Xiuli Zhang、Lei Wang
DOI:10.1002/adsc.201200868
日期:2013.3.11
2‐addition reaction of 1‐aryl‐1H‐tetrazoles with alkyl propiolates for the synthesis of highly functionalized enamines was developed. In the presence of silver oxide (Ag2O), the 1,2‐addition reaction generated (Z)‐N‐cyano enamines in good yields with exclusive formation of the Z‐isomers. Meanwhile, the 1,2‐addition reaction generated (E)‐N‐cyano enamines in the presence of Ag2O and potassium carbonate
开发了一种立体控制的1-芳基-1 H-四唑与丙酸烷基酯的1,2-加成反应,用于合成高度官能化的烯胺。在存在氧化银(Ag 2 O)的情况下,1,2加成反应生成的(Z)-N-氰基烯胺的收率很高,并且会独家形成Z-异构体。同时,在存在Ag 2 O和碳酸钾(K 2 CO 3)的情况下,1,2加成反应生成(E)-N-氰基烯胺,且立体选择性高,收率高。
Synthesis of 6-tetrazolyl-substituted sulfocoumarins acting as highly potent and selective inhibitors of the tumor-associated carbonic anhydrase isoforms IX and XII
作者:Aiga Grandane、Muhammet Tanc、Raivis Zalubovskis、Claudiu T. Supuran
DOI:10.1016/j.bmc.2014.01.043
日期:2014.3
A series of 6-substituted sulfocoumarins incorporating substituted-1,2,3,4-tetrazol-5-yl moieties were synthesized by reaction of 6-iodo-sulfocoumarin and the corresponding tetrazole via the CH activation reaction. The new sulfocoumarins incorporating alkyl and substituted aryl moieties at the 1-position of the tetrazole, were investigated for the inhibition of four human (h) carbonic anhydrase (hCA, EC 4.2.1.1) isoforms, the cytosolic hCA I and II; and the transmembrane, tumor-associated hCA IX and XII. The tetrazole-substituted sulfocoumarins did not inhibit the ubiquitous, off-target cytosolic isoforms (K(I)s > 10 mu M) but showed effective inhibition against the two transmembrane CAs, with KIs ranging from 6.5 to 68.6 nM against hCA IX, and between 4.3 and 59.8 nM against hCA XII. As hCA IX and XII are validated anti-tumor targets, such prodrug, isoform-selective inhibitors as the sulfocoumarins reported here, may be useful for identifying suitable drug candidates for clinical trials. (C) 2014 Elsevier Ltd. All rights reserved.
Synthetic manifestation of nitro substituted tetrazole-N-(hetero)aryl derivatives and energetic studies
作者:Nagarjuna Kommu、M. Balaraju、Vikas D. Ghule、Akhila K. Sahoo
DOI:10.1039/c6ta10621h
日期:——
substituted tetrazole-N-aryl/heteroaryl derivatives is discussed here. The energetic functional groups –NO2, –NHNO2 and –N3 are reliably inserted into the molecular backbone, making the tetrazole-N-aryl derivatives highly energetic and insensitive to heat and impact. For example, the tetrazole derivatives 7 and 8, bearing a –NO2 or a –NHNO2 group, exhibit energetic properties close to RDX, but with enhanced