Decarboxylative-Mediated Regioselective 1,3-Dipolar Cycloaddition for Diversity-Oriented Synthesis of Structurally exo′-Selective Spiro[oxindole-pyrrolidine-dihydrocoumarin] Hybrids
作者:Ying Zhou、Xiong-Wei Liu、Shun-Qin Chang、Qi-Lin Wang、Shuang Chen、Jun-Xin Wang、Wei Zhou
DOI:10.1055/s-0040-1707895
日期:——
high diastereoselectivities (up to 15:1 dr). It is based on the application of carboxylic acid activated coumarins as dienophiles followed by a decarboxylation process. The possible mechanism of the 1,3-dipolar cycloaddition is proposed via an exo′-transition state. Furthermore, this is the first example of decarboxylative-mediated regioselective 1,3-dipolar cycloaddition of 3-amino-oxindole-based
摘要 已经开发了基于3-氨基-氧吲哚基的偶氮甲碱和香豆素的通用和实用的三组分区域选择性1,3-偶极环加成反应。此反应显示出良好的底物耐受性,并提供了多种生物学相关的螺[ox-吲哚-吡咯烷-二氢香豆素]衍生物,带有四个连续的立体中心,包括一个螺四元中心,产率中等至高(高达90%),非对映选择性高(高达至15:1博士)。它基于羧酸活化的香豆素作为亲二烯体的应用,然后进行脱羧过程。通过exo提出了1,3-偶极环加成反应的可能机理'-过渡状态。此外,这是基于3-氨基-氧吲哚基的偶氮甲碱和香豆素的脱羧介导的区域选择性1,3-偶极环加成的第一个实例。