The Chameleonic Nature of the Nitro Group Applied to a Base-Promoted Cascade Reaction To Afford Indane-Fused Dihydrofurans
作者:Howard Díaz-Salazar、Juan Carlos Rodríguez-Colín、Josué Vazquez-Chavez、Marcos Hernández-Rodríguez
DOI:10.1021/acs.joc.3c00132
日期:2023.7.7
Michael/Conia-ene/SN2 cascade reaction for the synthesis of Indane-fused dihydrofurans from 1,3-dicarbonyl compounds and 2-alkynylnitrostyrenes promoted by potassium carbonate in DMSO at room temperature. In this reaction, the nitro group has a chameleonic role, first as an electron-withdrawing group for the Michael addition, then the nitronate behaves as a nucleophile, and finally, the allylic nitro acts as a
我们公开了在室温下在DMSO中碳酸钾促进下由1,3-二羰基化合物和2-炔基硝基苯乙烯合成茚满稠合二氢呋喃的Michael/Conia-ene/S N 2 级联反应。在该反应中,硝基具有变色作用,首先作为迈克尔加成的吸电子基团,然后硝基充当亲核试剂,最后,烯丙基硝基充当离去基团。该产品以单一非对映异构体形式获得,其中 1,3-酮酯含量高达 82%,1,3-二酮含量高达 58%。此外,反应机理的 DFT 计算解释了硝基化合物在烯醇化物上化学选择性加成到未活化的三键上,烯醇化物的加成是高度吸热的。