作者:Luo, Qiliang、Mao, Tao、Luo, Yao、Zhang, Yuxin、Wang, Fei、Dong, Shunxi、Feng, Xiaoming
DOI:10.1021/acs.orglett.4c02173
日期:——
A highly diastereo- and enantioselective cascade annulation reaction of Morita–Baylis–Hillman (MBH) maleimides of isatins with ortho-hydroxychalcones was achieved by a chiral N,N′-dioxide/Mg(II) complex Lewis acid catalyst. This strategy provides a concise and efficient route to densely functionalized spiro[cyclopentane-1,3′-oxindole] compounds with five consecutive stereocenters. The reaction itself
通过手性N,N'-二氧化物/Mg(II)络合物路易斯酸催化剂,实现了靛红的 Morita-Baylis-Hillman (MBH) 马来酰亚胺与邻羟基查耳酮的高度非对映和对映选择性级联成环反应。该策略为具有五个连续立体中心的密集官能化螺[环戊烷-1,3'-羟吲哚]化合物提供了简洁有效的途径。该反应本身具有条件温和、官能团相容性好、底物范围广(62个实例,收率高达99%,高达>20:1 dr,97% ee)的特点。此外,还观察到明显的配体加速效应和手性放大效应。进行 DFT 计算以阐明观察到的立体选择性。两种产品的克级合成和对 A549 细胞活力的抑制作用证明了当前方法的潜在效用。