Asymmetric Photoenolization/Diels–Alder Reaction of 2-Methylbenzaldehydes and 2-Alkylbenzophenones with Chromones
作者:Yuhao Mo、Lichao Ning、Zhe Luo、Liangkun Yang、Shi Tang、Shunxi Dong、Qi-Lin Zhou、Xiaoming Feng
DOI:10.1021/acscatal.4c01264
日期:——
enantioselective photoenolization/Diels–Alder reaction of 2-methylbenzaldehydes with chromones. Chiral N,N′-dioxide/ScIII and YbIII complexes were found to interact with both photoenol intermediates and chromones simultaneously, accelerating the Diels–Alder reaction in an efficient and stereoselective manner. Experimental studies and DFT calculations were carried out to understand the reaction mechanism and the
不对称光烯醇化/狄尔斯-阿尔德反应为复杂的手性多环提供了一种简单且原子经济的途径。与2-烷基二苯甲酮的成熟转化相比,2-甲基苯甲醛的对映选择性光烯醇化/Diels-Alder反应由于寿命较短且不稳定的光烯醇中间体而具有挑战性。在此,我们提出了 2-甲基苯甲醛与色酮的高度对映选择性光烯醇化/狄尔斯-阿尔德反应。发现手性N、N '-二氧化物/Sc III和 Yb III配合物同时与光烯醇中间体和色酮相互作用,以有效和立体选择性的方式加速 Diels-Alder 反应。通过实验研究和DFT计算来了解反应机理和立体选择性的起源。此外,2-烷基二苯甲酮也是合适的底物。以良好的产率和高的非对映选择性和对映选择性提供了一系列具有邻位多取代立构中心的手性稠合多环。