The quaternary carbon in a 4H-carbazol-4-one can be introduced with high stereoprecision in the cyclohexadienone annulation of a 2-indolyl chromium carbene complex bearing an imidazolidinone chiral auxiliary. The chiral complex 12 was found to exist as atropisomers that were readily separated, and each was found to react with the same alkyne to give opposite configurations at the quaternary carbon
可以高立体精度将4 H-
咔唑-4-酮中的季碳引入带有
咪唑烷酮手性助剂的2-
吲哚基
铬卡宾配合物的环己二酮环化中。发现手性络合物12以易于分离的阻转异构体的形式存在,并且发现它们各自与相同的炔反应,在4 H-
咔唑-4-一产物的季碳上给出相反的构型。