Chiral Tertiary Amine Catalyzed Asymmetric [4 + 2] Cyclization of 3-Aroylcoumarines with 2,3-Butadienoate
作者:Jun-Lin Li、Xiao-Hui Wang、Jun-Chao Sun、Yi-Yuan Peng、Cong-Bin Ji、Xing-Ping Zeng
DOI:10.3390/molecules26020489
日期:——
commonly found structural units in natural products. Therefore, the introduction of 2H-pyran moiety into the coumarin structural unit, i.e., dihydrocoumarin-fused dihydropyranones, is a potentially successful route for the identification of novel bioactive structures, and the synthesis of these structures has attracted continuing research interest. Herein, a chiral tertiary amine catalyzed [4 + 2] cyclization
香豆素和 2H-吡喃衍生物是天然产物中最常见的结构单元。因此,将2H-吡喃部分引入香豆素结构单元,即二氢香豆素稠合的二氢吡喃酮,是鉴定新型生物活性结构的潜在成功途径,并且这些结构的合成引起了持续的研究兴趣。本文报道了手性叔胺催化 3-芳酰基香豆素与 2,3-丁二烯酸苄酯的 [4 + 2] 环化反应。在 Kumar 的 6'-(4-联苯)-β-异辛可宁的存在下,可以以高达 97% 的产率和 90% 的 ee 值获得所需的二氢香豆素稠合二氢吡喃酮产品。