Chemoselective synthesis of ketones and ketimines by addition of organometallic reagents to secondary amides
作者:William S. Bechara、Guillaume Pelletier、André B. Charette
DOI:10.1038/nchem.1268
日期:2012.3
is of great importance, as this motif serves as a synthetic handle for the elaboration of numerous organic functionalities. In this context, we report a general and chemoselective method based on an activation/addition sequence on secondary amides allowing the controlled isolation of structurally diverse ketones and ketimines. The generation of a highly electrophilic imidoyl triflate intermediate was
高效和选择性转化的发展在合成化学中至关重要,因为它为复杂分子的全合成开辟了新的可能性。将此类反应应用于酮的合成非常重要,因为该基序可作为合成众多有机功能的手柄。在这种情况下,我们报告了一种基于仲酰胺活化/加成序列的通用化学选择性方法,允许控制分离结构不同的酮和酮亚胺。发现高度亲电子的亚胺酰基三氟甲磺酸酯中间体的产生在观察到的异常官能团耐受性中起关键作用,允许将现成的格氏试剂和二有机锌试剂轻松添加到酰胺中,避免常见的过度加成或还原副反应。该方法已应用于抗肿瘤剂 Bexarotene 类似物的正式合成,以及在一锅法中快速有效地合成不对称二酮。