A Concise Approach Toward Tetrazolyl-Substituted Benzazocines via a Novel Isocyanide-Based Multicomponent Reaction
摘要:
The synthesis of pharmacologically relevant isoquinoline-tetrazoles and benzazocine-tetrazoles via sequential azido-Ugi and alkyne-induced ring-expansion reactions starting from cotarnine chloride are reported. A one-pot, multicomponent reaction protocol toward the ring-expanded product is also described.
Silver-Catalyzed [3+2] Cycloaddition of Azomethine Ylides with Isocyanides for Imidazole Synthesis
作者:Zhongyan Hu、Jinhuan Dong、Xianxiu Xu
DOI:10.1002/adsc.201700447
日期:2017.10.25
silver-catalyzed aerobic oxidative [3+2] cycloaddition of azomethineylides with aryl or heteroaryl isocyanides has been developed. The reaction represents a novel protocol for the efficient and practical synthesis of 1,2-diarylimidazoles bearing a broad range of substituents in good to excellent yields under mild conditions. The practicability of this cycloaddition was shown by a gram-scale synthesis
A Novel Method for Preparing Isocyanides from N-Substituted Formamides with Chlorophosphate Compounds
作者:Yoshikazu Kitano、Genki Kobayashi、Tateo Saito
DOI:10.1055/s-0030-1260211
日期:2011.10
Treatment of N-substituted formamides with chlorophosphate compounds such as PhOPOCl2, EtOPOCl2, Me2NPOCl2, and (PhO)2POCl and tertiary amines such as triethylamine, pyridine, and N,N-diisopropylethylamine produced the corresponding isocyanides in high yields. This method can be used to prepare various alkyl and aryl isocyanides. isocyanide - isonitrile - formamide - dehydration - dichlorophosphate
A multicomponent reaction of isocyanides, ditellurides and manganese(III) carboxylates under mild reaction conditions leads to the synthesis of various N-acyl tellurocarbamates. This method demonstrates good functional tolerance and broad substrate scope and, as a result, is especially suitable for the postfunctionalization of complicated molecules such as drugs. The given method can be further extended
Lewis Acid Catalyzed [4+1] Cycloaddition of o-Quinone Methides and Isocyanides: Mild and Efficient Synthesis of 3-Aryl-2-aminobenzofurans
作者:Xinyao Li、Cun Yang、Yanze Li、Qiwen Huang
DOI:10.1055/a-2030-6874
日期:——
We herein report a mild and efficient synthesis of 3-aryl-2-aminobenzofurans by Lewisacidcatalyzed [4+1] cycloaddition of in situ generated o-quinone methides and isocyanides. Compared with the well-known methods, the current reactions are carried out under mild conditions and feature wide substrate scope in high yields at ambient temperature at catalyst loadings as low as 1 mol%. DFT calculations
The formation of isocyanides from formamides using XtalFluor-E, [Et2NSF2]BF4, is presented. A wide range of formamides can be used to produce the corresponding isocyanides in up to 99% yield. In a number of cases, the crude products showed good purity (generally >80% by NMR) allowing to be used directly in multi-component reactions. (C) 2014 Elsevier Ltd. All rights reserved.