Asymmetric [3+2] Annulations to Construct 1,2-Bispirooxindoles Incorporating a Dihydropyrrolidine Motif
作者:Qing He、Wei Du、Ying-Chun Chen
DOI:10.1002/adsc.201700849
日期:2017.11.10
applications in medicinal chemistry. Here we present an asymmetric [3+2] annulation reaction of Morita–Baylis–Hillman carbonates from isatins and isatin‐based N‐Boc‐ketimines under the catalysis of a newly designed multifunctional 4‐dimethylaminopyridine‐type substance. The reaction shows high γ‐regioselectivity, producing highly complex 1,2‐bispirooxindoles incorporating a dihydropyrrolidine motif in excellent
构造手性双螺硫辛酯很难实现,但由于其在药物化学中的许多潜在应用,因此具有很高的吸引力。在此,我们介绍了在新设计的多功能4-二甲基氨基吡啶类物质的催化下,由靛红和基于靛红的N - Boc-酮亚胺形成的森田-贝利斯-希尔曼碳酸盐的不对称[3 + 2]环化反应。该反应显示出高的γ-区域选择性,可产生具有二氢吡咯烷基序的高度复杂的1,2-双螺并氧杂吲哚类化合物,产率高,立体选择性中等至出色(dr > 19:1,ee > 99%))。该协议已扩展为利用含三氟甲基的酮亚胺,以适度的对映选择性提供具有稠合和螺环骨架的复杂结构。