Catalytic Direct Nucleophilic Substitution of Primary Morita–Baylis–Hillman Adducts and Application to the Straightforward Synthesis of Dihydroisoindolones
iron/boron-catalyzed direct nucleophilicsubstitution of functionalized primary allylic alcohols with a large variety of nucleophiles. The resulting substitution products are useful synthetic platforms for heterocycle synthesis, as illustrated in a ready access to tetrahydroisoindol-4-ones. An interesting γ-carbonyl effect permits the dual iron/boron-catalyzed direct nucleophilicsubstitution of functionalized
Asymmetric Synthesis of 2,3‐Disubstituted Cyclic Ketones by Enantioselective Conjugate Radical Additions
作者:Sukanya Nad、Mukund P. Sibi
DOI:10.1002/hlca.201900223
日期:2019.12
Enantioselectiveconjugate radical addition to 2‐acyloxymethyl cycloalkenones proceeds in high yield with outstanding diastereoselectivity and excellent enantioselectivity using chiral salen Lewis acids. The process provides access to 2,3‐disubstituted cycloalkanones, a structural motif present in natural products.
A Stereoconvergent Tsuji–Trost Reaction in the Synthesis of Cyclohexenyl Nucleosides
作者:Anna Esposito、Concetta Giovanni、Maria De Fenza、Giovanni Talarico、Marco Chino、Giovanni Palumbo、Annalisa Guaragna、Daniele D'Alonzo
DOI:10.1002/chem.201905367
日期:2020.2.26
A highly regio- and stereoselective route to d- and l-cyclohexenyl nucleosides has been devised, using the Tsuji-Trost reaction as the key step. Contrarily to the widely accepted mechanism (involving a net retention of configuration), the reaction proceeded in a highly stereoconvergent manner, providing cis nucleosides regardless of the relative configuration of the starting materials. DFT calculations