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。
A series of highly substituted 2-perfluoroalkyl-3-iodoquinolines are prepared by two different methods in good to excellent yields under mild reaction conditions. The first method involves iodocyclization of perfluoroalkyl propargyl imines with I2-CAN. The second method involves iodocyclization of perfluoroalkyl propargyl amines using I2 and ICl. The perfluoroalkyl propargyl amines are prepared in
Biomimetic reduction of imines and heteroaromatics with chiral and regenerable [2.2]Paracyclophane-Based NAD(P)H model CYNAM
作者:Zhou-Hao Zhu、Yi-Xuan Ding、Yong-Gui Zhou
DOI:10.1016/j.tet.2021.131968
日期:2021.3
In our previous work, we reported the synthesis of chiral and regenerable [2.2]paracyclophane-derived NAD(P)Hmodels CYNAMs and their application in biomimetic asymmetric reduction of tetrasubstituted olefins. Herein, the biomimetic asymmetric reduction of imines and heteroaromatics has been successfully achieved using the chiral and regenerable CYNAMs and simple achiral phosphoric acid as the transfer
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
Highly chemoselective catalytictransferhydrogenation of fluorinated alkynyl ketimines has been achieved by employing chiralphosphoricacid as a catalyst with benzothiazoline as a hydride source, providing the corresponding chiral fluorinated propargylamines in good yields and excellent enantioselectivities. In addition, iodocyclization of fluorinated propargylamine affords chiral 3-iodo-2-(trifluoromethyl)-1