作者:Emily R. T. Robinson、Charlene Fallan、Carmen Simal、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/c3sc50199j
日期:——
The asymmetric annulation of a range of α,β-unsaturated acyl ammonium intermediates, formed from isothiourea HBTM 2.1 and anhydrides with either 1,3-dicarbonyls, β-ketoesters or azaaryl ketones gives either functionalised esters (upon ring opening), dihydropyranones or dihydropyridones in good yields (up to 93%) and high enantioselectivity (up to 97% ee).
Lewis Base‐Catalysed Enantioselective Radical Conjugate Addition for the Synthesis of Enantioenriched Pyrrolidinones
作者:Will C. Hartley、Florian Schiel、Elena Ermini、Paolo Melchiorre
DOI:10.1002/anie.202204735
日期:2022.6.27
to realise the first example of asymmetric radical conjugate addition to α,β-unsaturated anhydrides and esters. The chemistry, mastered by a chiral isothiourea organocatalyst, enables the synthesis of enantioenriched pyrrolidinones, with application to the synthesis of biologically-active γ-amino butyric acids.
Enantioselective Synthesis in Continuous Flow: Polymer-Supported Isothiourea-Catalyzed Enantioselective Michael Addition–Cyclization with α-Azol-2-ylacetophenones
作者:Zhanyu Zhou、Kevin Kasten、Tengfei Kang、David B. Cordes、Andrew D. Smith
DOI:10.1021/acs.oprd.4c00113
日期:2024.5.17
incorporating a polymer-supported isothiourea HyperBTM catalyst derivative has been used to promote the enantioselective synthesis of a range of heterocyclic products derived from α-azol-2-ylacetophenones and -acetamides combined with alkyl, aryl, and heterocyclicα,β-unsaturated homoanhydrides in continuous flow via an α,β-unsaturated acyl-ammonium intermediate. The products are generated in good to