Phosphine‐oxide‐catalyzed Enantioselective Cross‐aldol Reactions of Aldehydes with Trichlorosilane as Lewis Acid Promoter
作者:Shunsuke Kotani、Takuya Hanamure、Yoshiki Mori、Makoto Nakajima
DOI:10.1002/cctc.202000914
日期:2020.10.6
Lewis acid mediator that successfully promotes highly enantioselective cross‐aldol reactions between two aldehydes. The high yielding transformation is realized with the assistance of triisobutylamine, which does not decompose trichlorosilane but rather converts the aldol donor into the silyl enol ether that undergoes the enantioselective cross‐aldol reaction with a second aldehyde in combination with
三氯硅烷和手性氧化膦之间的高价硅络合物可作为有效的路易斯酸介体,成功促进两个醛之间的高度对映选择性的交叉羟醛反应。在三异丁胺的帮助下实现了高收率的转化,三异丁胺不会分解三氯硅烷,而是将羟醛供体转化为甲硅烷基烯醇醚,与第二种醛结合手性氧化膦催化剂进行对映选择性交叉羟醛反应。