Gold-Catalyzed 1,3-Acyloxy Migration/5-exo-dig Cyclization/1,5-Acyl Migration of Diynyl Esters
作者:David Lebœuf、Antoine Simonneau、Corinne Aubert、Max Malacria、Vincent Gandon、Louis Fensterbank
DOI:10.1002/anie.201101179
日期:2011.7.18
Working three shifts: Polyconjugated δ‐diketones are formed stereoselectively in high yields by the gold‐catalyzed rearrangement of 1,6‐diyn‐3‐yl esters. This cascade involves a 1,3‐sigmatropic acyloxy shift, a 5‐exo‐dig cyclization of the resulting allenyne, and an unprecedented 1,5‐sigmatropic shift of an acyl fragment. The usefulness of the products was shown by an efficient acid‐catalyzed transformation
进行三班制:通过金催化的1,6-二炔基-3-基酯的重排,高收率立体选择性地形成了多共轭δ-二酮。这种级联反应涉及1,3-σ的酰氧基转移,所得烯丙炔的5- exo- dig环化反应以及酰基片段前所未有的1,5-σ的转移。有效的酸催化转化为复杂的多环骨架表明了产品的实用性。