Enantioselective Synthesis of Chromanones through Organocatalytic Tandem Reactions
作者:Mengxue Lu、Xin Wang、Zongli Xiong、Jingxiang Duan、Wen Ren、Weijun Yao、Yi Xia、Zhen Wang
DOI:10.1002/adsc.202001031
日期:2020.12.8
An enantioselective approach to lactone‐fused chromanone derivatives from 1‐(2‐hydroxyaryl)‐1,3‐diketones and α,β‐unsaturated aldehydes under mild conditions has been developed, which included organocatalytic stepwise Michael addition/ cycloketalization/hemiacetalization and followed by oxidation reaction. In the presence of chiral amine organocatalyst and an additional salicylic acid, a wide range
已开发出在温和条件下对1-(2-羟基芳基)-1,3-二酮和α,β-不饱和醛与内酯融合的苯并二氢吡喃酮衍生物的对映选择性方法,包括逐步进行有机催化迈克尔加成/环缩酮化/半缩醛化氧化反应。在存在手性胺有机催化剂和其他水杨酸的情况下,可耐受多种1-(2-羟基芳基)-1,3-二酮和α,β-不饱和醛,从而提供了一系列内酯稠合的三环色酮三个高产量的连续立体中心,具有良好到极好的选择性(90-> 99%ee,> 19:1 dr)。