Anionic Amino-Cope Rearrangement Cascade Synthesis of 2,4-Substituted Benzoate Esters from Acyclic Building Blocks
作者:M. Haziq Qureshi、Jon T. Njardarson
DOI:10.1021/acs.orglett.2c03134
日期:2022.11.4
We report a new anionic cascade for assembling 2,4-substituted benzoate esters in one pot from racemic β-fluoro-substituted conjugated tert-butylsulfinyl imines and 3-substituted methyl 2-butenoates. Dienolate formation triggers a Mannich addition followed by an amino-Cope like rearrangement, which results in immediate elimination of fluoride by a lithiated enamine. The newly formed 1,4-diene intermediate
我们报告了一种新的阴离子级联,用于在一个锅中从外消旋 β-氟取代的共轭叔丁基亚磺酰亚胺和 3-取代的 2-丁烯酸甲酯组装 2,4-取代的苯甲酸酯。二烯醇化物的形成触发曼尼希加成,随后发生氨基-Cope 样重排,导致锂化烯胺立即消除氟化物。新形成的 1,4-二烯中间体含有一个自发去质子化的高酸性质子,导致容易的分子内环化,然后亚磺酰胺基团消除和芳构化。