Formal [4 + 2] Cycloadditions of Anhydrides and α,β-Unsaturated <i>N</i>-Tosyl Ketimines
作者:Noah P. Burlow、Sara Y. Howard、Carla M. Saunders、James C. Fettinger、Dean J. Tantillo、Jared T. Shaw
DOI:10.1021/acs.orglett.8b04091
日期:2019.2.15
ketone-derived imines is reported. Cyclic, enolizable anhydrides undergo a base-promoted conjugate addition reaction with α,β-unsaturated N-tosyl ketimines, followed by an intramolecular acylation to give formal [4 + 2] cycloaddition products. The carboxylic acid-containing products are formed with modest selectivity for the cis-diastereomer and can be fully epimerized to the trans-diastereomer upon esterification
报道了一种由酸酐和酮衍生的亚胺非对映选择性合成高度取代的β-烯胺酮的方法。环状可烯醇化酸酐与α,β-不饱和N-甲苯磺酰基酮亚胺进行碱促进的共轭加成反应,然后进行分子内酰化,得到正式的[4 + 2]环加成产物。所形成的含羧酸的产物对顺式-非对映异构体具有适度的选择性,并且在酯化后可以完全差向异构为反式-非对映异构体。