The base-free van Leusen reaction of cyclic imines on water: synthesis of <i>N</i>-fused imidazo 6,11-dihydro β-carboline derivatives
作者:Killari Satyam、V. Murugesh、Surisetti Suresh
DOI:10.1039/c9ob00660e
日期:——
imidazoles has been demonstrated on water under base-free conditions. The reaction of dihydro β-carboline imines and p-toluenesulfonylmethyl isocyanides furnished the corresponding substituted N-fused imidazo 6,11-dihydro β-carboline derivatives in very good yields under ambient conditions. The use of deuteriumoxide (D2O) as a solvent enabled the incorporation of deuterium isotopes in the imidazole ring
Accessing benzo[f]indole-4,9-diones via a ring expansion strategy: silver-catalyzed tandem reaction of tosylmethyl isocyanide (TosMIC) with 2-methyleneindene-1,3-diones
A silver-catalyzed tandemreaction of TosMIC with 2-methyleneindene-1,3-diones was developed for the direct synthesis of benzo[f]indole-4,9-diones. In this reaction, a domino [3+2]-cycloaddition/imidoyl anion cyclization/ring opening of cyclopropanolate/aromatization is proposed and three CC bonds are formed successively.
为了直接合成苯并[ f ]吲哚-4,9-二酮,开发了一种TosMIC与2-亚甲基茚-1,3-二酮的银催化串联反应。在该反应中,提出了多米诺[3 + 2]-环加成/亚酰胺基阴离子环化/环丙醇酸酯的开环/芳族化,并连续形成三个C C键。
One-Pot Van Leusen Synthesis of 4,5-Disubstituted Oxazoles in Ionic Liquids
An efficient and mild protocol for the preparation of 4,5-disubstituted oxazoles through an improved one-pot van Leusen oxazole synthesis in ionic liquids is described. The oxazole products were prepared from tosylmethyl isocyanide (TosMIC), aliphatic halides and various aldehydes in high yields. The recovered ionic liquids could be reused as solvent for six runs without significant loss of yields.
本文介绍了在离子液体中通过改进的单锅 van Leusen噁唑合成法制备 4,5-二取代噁唑的高效而温和的方案。以甲苯基甲基异氰酸酯 (TosMIC)、脂肪族卤化物和各种醛为原料,高产率地制备了噁唑产品。回收的离子液体可作为溶剂重复使用六次,且收率无明显下降。
Heterocyclizations with Tosylmethyl Isocyanide Derivatives. A New Approach to Substituted Azolopyrimidines
作者:Alejandro Baeza、Javier Mendiola、Carolina Burgos、Julio Alvarez-Builla、Juan J. Vaquero
DOI:10.1021/jo050029r
日期:2005.6.1
An efficient synthesis of substituted azolopyrimidines such as pyrido[3‘,2‘:4,5]pyrrolo[1,2-c]pyrimidines, pyrimido[1,6-a]indoles, benzo[4,5]imidazo-[1,2-c]pyrimidines, an imidazo[1,2-c]pyrimidine, and pyrazolo[1,5-c]pyrimidines is described. The method involves the reaction of N-protected bromomethylazoles and tosylmethyl isocyanide (TosMIC) derivatives in nonanhydrous media. The study of the reaction
高效合成取代的吡唑并嘧啶,例如吡啶并[3',2':4,5]吡咯并[1,2- c ]嘧啶,嘧啶并[1,6- a ]吲哚,苯并[4,5]咪唑并[1]描述了,2- c ]嘧啶,咪唑并[1,2- c ]嘧啶和吡唑并[1,5- c ]嘧啶。该方法涉及在无水介质中N保护的溴甲基唑与甲苯磺酰基甲基异氰化物(TosMIC)衍生物的反应。对反应条件的研究表明,该方法仅在使用苄基三乙基氯化铵作为催化剂的相转移条件下(CH 2 Cl 2 /30%NaOH水溶液)成功。