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
Dienolate Annulation Approach for Assembly of Densely Substituted Aromatic Architectures
作者:Kevin A. Scott、Jeffrey R. Groch、Isaac Chogii、Michael D. Delost、Pradipta Das、Jon T. Njardarson
DOI:10.1021/acs.joc.1c01211
日期:2021.8.6
anion-cascade union of an enoate and a conjugated imine affords cyclohexenone products, which are readily aromatized to phenols. By engaging the intermediate cyclohexenones with Grignard reagents, a facile addition/elimination proceeds yielding chiral cyclohexadienes, which are then aromatized. In a complementary approach, the cyclohexenone products are converted into enol triflates, which provides a gateway to