含稠合环丙烷环的γ-内酯化合物是许多领域的通用结构单元,包括生物活性化合物的合成。在这里,我们报道了在 Cs 2 CO 3和可见光存在下,烯烃束缚的N-甲苯磺酰腙的光驱动分子内环丙烷化反应。我们采用无自由基方法,在无过渡金属的条件下以良好的收率合成了各种电子和空间取代且含杂环的稠合-(螺)环丙烷γ-内酯化合物。此外,还介绍了从α-酮酯一锅法合成稠合环丙烷γ-内酯及其合成实用性。
Decarbonylative Coupling of α-Keto Acids and Ynamides for Synthesis of β-Keto Imides
作者:Renjie Chen、Linwei Zeng、Bo Huang、Yangyong Shen、Sunliang Cui
DOI:10.1021/acs.orglett.8b01302
日期:2018.6.1
A novel decarbonylative coupling of α-keto acids and ynamides with extrusion of CO for synthesis of β-keto imides is reported. This process features mild reaction conditions, a broad substrate scope, and high efficiency. An isotope-labeling reaction and GC analysis were conducted to elucidate a plausible reaction mechanism.
corresponding phenyl selenoesters, aldehydes, and alpha-keto carboxylic acids and the scope of their participation in intermolecular addition reactions to carbon-carbon double bonds have been studied. Whereas the phenyl selenoester method has provided easy access to a variety of 1,4-dicarbonyl compounds bearing the 2-acylindole moiety, the glyoxylic acid route has been employed for the preparation of 2-indolyl