A Single-Step Synthesis of 4-Oxazolin-2-ones and Their Use in the Construction of Polycyclic Structures Bearing Quaternary Stereocenters
作者:Blanca M. Santoyo、Carlos González-Romero、Omar Merino、Rafael Martínez-Palou、Aydeé Fuentes-Benites、Hugo A. Jiménez-Vázquez、Francisco Delgado、Joaquín Tamariz
DOI:10.1002/ejoc.200900114
日期:2009.5
for the synthesis of 4-oxazolin-2-ones by a one-pot MW-promoted condensation of α-ketols and isocyanates is reported. An alternative thermal approach using the same starting materials is also described. These cyclic enamides were efficient nucleophiles, reacting with Michael acceptors and prenyl bromide to give a variety of polycyclicstructuresbearing one or two quaternarystereocenters. The selectivity
Synthesis of Diarylamines and Methylcarbazoles and Formal Total Synthesis of Alkaloids Ellipticine and Olivacine
作者:Edson Barrera、R. Israel Hernández‐Benitez、Carlos A. González‐González、Carlos H. Escalante、Aydeé Fuentes‐Benítes、Carlos González‐Romero、Elvia Becerra‐Martínez、Francisco Delgado、Joaquín Tamariz
DOI:10.1002/ejoc.202200364
日期:2022.6.27
A versatile and efficient methodology for the synthesis of 1-methyl and 1,4-dimethyl 3-formylcarbazoles is described. Microwave-promoted one-pot cascade reactions of 4-oxazolin-2-ones afforded methylated diarylamines, which were cyclized into a series of carbazoles, including the formaltotalsynthesis of the naturally occurring pyrido[4,3-b]carbazole alkaloids ellipticine and olivacine.
描述了一种用于合成 1-甲基和 1,4-二甲基 3-甲酰基咔唑的通用且有效的方法。微波促进 4-恶唑啉-2-酮的一锅级联反应得到甲基化二芳基胺,将其环化成一系列咔唑,包括天然存在的吡啶并[4,3- b ]咔唑生物碱玫瑰树碱的正式全合成和橄榄素。