Carbonylative Sonogashira annulation sequence: One-pot synthesis of 4-quinolone and 4H-chromen-4-one derivatives
作者:Prasanjit Ghosh、Aritra Kumar Nandi、Sajal Das
DOI:10.1016/j.tetlet.2018.04.029
日期:2018.5
Carbonylative Sonogashira annulation sequence for one pot synthesis of 4-quinolone and 4H-chromen-4-one has been developed in presence of Pd-NHC catalyst. Substituted 2-iodoaniline and 2-iodophenol independently underwent in the carbonylative Sonogashira annulation reaction with a variety of acetylenes to result in 4-quinolone and flavone derivatives respectively in good to excellent yield. Moreover
在Pd-NHC催化剂的存在下,已经开发了用于一锅合成4-喹诺酮和4 H -chromen-4-one的羰基化Sonogashira环化序列。在羰基化的Sonogashira与多种乙炔的环化反应中,分别进行取代的2-碘苯胺和2-碘苯酚的合成,分别以良好或优异的收率得到4-喹诺酮和黄酮衍生物。而且,该方案不需要有毒的CO气体,高催化剂负载量和任何昂贵的盐/添加剂。本文中,我们首次使用Mo(CO)6作为固体CO源,用于通过羰基化Sonogashira环化反应一锅合成黄酮衍生物。
Divergent synthesis of chromones and chromanones from diketones using an AgOTf/[Si]H system by switching hydrosilanes
divergent synthesis of chromones and chromanones from a common substrate via reductive coupling cyclization by switching hydrosilanes has been developed. Results of mechanistic studies revealed that under PhMeSiH conditions, the reaction initially undergone cyclization to form chromones , which can subsequently be reduced to yield chromanones . When the hydrosilane was switched to EtSiH, the reaction route