Tertiary Carbinamine Synthesis by Rhodium-Catalyzed [3+2] Annulation of N-Unsubstituted Aromatic Ketimines and Alkynes
作者:Zhong-Ming Sun、Shuo-Ping Chen、Pinjing Zhao
DOI:10.1002/chem.200902814
日期:2010.2.22
A convenient and waste‐free synthesis of indene‐based tertiary carbinamines by rhodium‐catalyzed imine/alkyne [3+2] annulation is described. Under the optimized conditions of 0.5–2.5 mol % [(cod)Rh(OH)}2] (cod=1,5‐cyclooctadiene) catalyst, 1,3‐bis(diphenylphosphanyl)propane (DPPP) ligand, in toluene at 120 °C, N‐unsubstituted aromatic ketimines and internal alkynes were coupled in a 1:1 ratio to form
本文描述了铑催化的亚胺/炔烃[3 + 2]环合法方便,无浪费地合成基于茚的叔卡宾胺。在0.5–2.5 mol%[(cod)Rh(OH)} 2 ](cod = 1,5-环辛二烯)催化剂的最佳条件下,甲苯中的1,3-双(二苯基膦基)丙烷(DPPP)配体120°C时,N-未取代的芳族酮亚胺和内部炔烃以1:1的比例偶联,形成高1 H-茚满-1-叔胺,且收率高,且与异喹啉产品相比具有很高的选择性。可能的催化循环包括依次进行亚胺定向的芳香族CH键活化,炔烃插入,以及分子内酮亚胺插入Rh I-烯基键合的罕见例子。