Highly enantioselective [3+2] annulation of 4-amino-isoxazoles with quinone monoimines to access structurally diverse isoxazoline fused dihydrobenzofurans and antifungal evaluation
作者:Ying-kun Yan、Ai-ling Bao、Min Li、Xian-song Xie、Wen-zhe Li、Xiao-mei Zhang
DOI:10.1016/j.molstruc.2023.136277
日期:2023.12
The first catalytic enantioselective [3+2] cyclization between 4-amino-isoxazoles and quinone monoimines was achieved by using a chiral phosphoric acid catalyst. This transformation afforded a series of isoxazoline fused dihydrobenzofuran derivatives with two sequential chiral centers in high yields and outstanding enantioselectivities. The absolute configuration of the title compounds was determined
通过使用手性磷酸催化剂实现了4-氨基异恶唑和醌单亚胺之间的首次催化对映选择性[3+2]环化。该转化以高产率和出色的对映选择性提供了一系列具有两个连续手性中心的异恶唑啉稠合二氢苯并呋喃衍生物。通过X射线晶体结构分析确定标题化合物的绝对构型。所得产品的后续应用对五种植物病原真菌表现出良好的抗真菌活性,进一步证明了这种转化的多功能性。该方法为合成含有异恶唑啉稠合二氢苯并呋喃骨架的相应生物活性分子提供了一种极好的替代策略。