Radical selenylative cyclization of trifluoromethyl propargyl imines for the synthesis of trifluoromethyl- and seleno-azaspiro[4,5]-tetraenones and quinolines
A radical selenylative cyclization of trifluoromethyl propargyl imines with diselenides for the regiodivergent construction of diversely functionalized azaspiro[4,5]-tetraenones and quinolines has been developed, which enables dual incorporation of CF3 and Se groups into heterocycles in a one-pot reaction. When using Oxone as a green oxidant, the reaction proceeds through oxidative dearomative ipso-annulation
已经开发了三氟甲基炔丙基亚胺与二硒化物的自由基硒化环化反应,用于区域发散构建不同功能化的氮杂螺[4,5]-四烯酮和喹啉,这使得能够在一锅反应中将CF 3和 Se 基团双重结合到杂环中。当使用Oxone作为绿色氧化剂时,反应通过氧化脱芳烃自身环化或分子内邻位环化进行,表现出良好的区域选择性。通过放大反应和对所得产物的进一步修饰证明了该方法的合成效用。
Catalytic Enantioselective Transfer Hydrogenation–Carboxylative Cyclization to 4-Fluoroalkyl 2-Oxazolidinone with CO<sub>2</sub> as the C1 Synthon
作者:Zheng Zhang、Zhi-Hao Zhang、Feng Zhou、Jian Zhou
DOI:10.1021/acs.orglett.1c00632
日期:2021.4.2
We report a sequential catalytic asymmetric transfer hydrogenation–carboxylative cyclization for the facile construction of chiral 4-fluoroalkyl 2-oxazolidinones with high enantioselectivity. The resulting 2-oxazolidinones can be easily elaborated to synthetic useful chiral β-fluoroalkyl β-amino alcohols. This research also represents a rare example of catalytic asymmetric sequential reactions using