A copper-catalyzed domino synthesis of 4H-pyrido[1,2-a]pyrimidin-4-ones has been developed from 1,4-enediones and 2-aminoheterocycles with air as the oxidant.
DABCO catalyzed unusual formal [4 + 2] cycloaddition of 3-acyl(or alkoxycarbonyl)-1,4-enediones with 2,3-butadienoates: effective access to highly functionalized pyrans
作者:Xiang-Suo Meng、Shan Jiang、Xiao-Yun Xu、Qiang-Xian Wu、Yu-Cheng Gu、De-Qing Shi
DOI:10.1039/c6ra15117e
日期:——
A convenient and efficient DABCO-catalyzed formal [4 + 2] cycloaddition of 3-acyl(or alkoxycarbonyl)-1,4-enediones with 2,3-butadienoates is presented. This transformation takes advantage of mild conditions, wide substrate scope and significant functionalgroup tolerance as well as excellent regioselectivity, which makes this method powerful for one-pot synthesis of highly functionalized pyrans in
One-Pot Synthesis of (Guaiazulen-1-yl)furan Derivatives from Guaiazulene and 1,4-Diaryl-2-butene-1,4-diones
作者:Dao-Lin Wang、Jiao Xu、Jia-Yi Yu、Zhe Dong
DOI:10.3987/com-13-12690
日期:——
A facile, convenient, efficient, and high yielding synthesis of 3-(guaiazulen-1-yl)furan derivatives (3) has been developed by the condensation of guaiazulene (1) with 1,4-diaryl-2-butene-1, 4-diones (2) as nucleophiles in the presence of p-toluenesulfonic acid as the catalyst.