Synthesis of 2,8-Dioxabicyclo[3.3.1]nonane Derivatives via a Sequential Knoevenagel Condensation and Hetero-Diels–Alder Reaction in an Aqueous Medium
摘要:
Utilizing aldehyde-substituted vinylogous carbonates and 1,3-diketones, a simple protocol is presented for the synthesis of 2,8-dioxabicyclo[3.3.1]nonane derivatives via Knoevenagel condensation followed by a hetero-Diels-Alder reaction under green reaction conditions. The structure of a key product is unequivocally confirmed by X-ray crystallography.
<i>N</i>-Heterocyclic Carbene/Palladium Cascade Catalysis: Construction of 2,2-Disubstitiuted Benzofuranones from the Reaction of 3-(2-Formylphenoxy)propenoates with Allylic Esters
carbene (NHC) and palladium/ligand was demonstrated. In the presence of a triazolium salt, palladiumcatalyst, and base, the reaction of 3-(2-formylphenoxy)propenoates and allylic esters proceeded efficiently under mild conditions to afford 2-allylbenzofuran-3-one-2-acetates in moderated to good yields. An asymmetric cascade catalysis was achieved when (R)-BINAP was employed as a chiral ligand, producing
Efficient synthesis of chiral cyclic acetals by metal and Brønsted acid co-catalyzed enantioselective four-component cascade reactions
作者:Lin Qiu、Xin Guo、Chaoqun Ma、Huang Qiu、Shunying Liu、Liping Yang、Wenhao Hu
DOI:10.1039/c3cc49063g
日期:——
Four-component Mannich reactions subsequently followed by an intramolecular oxo-Michael addition were developed to efficiently produce chiral cyclic acetals with high diastereoselectivity and enantioselectivity.
Diastereoselective Three-Component Cascade Reaction to Construct Oxindole-Fused Spirotetrahydrofurochroman Scaffolds for Drug Discovery
作者:Lin Qiu、Dongwei Wang、Yubing Lei、Lixin Gao、Shunying Liu、Jia Li、Wenhao Hu
DOI:10.1002/ejoc.201600315
日期:2016.5
A one-pot synthesis of new oxindole-fused polycyclic scaffolds is reported. The process involves a three-component [3+2] cycloaddition followed by cyclization through an intramolecular Michaeladdition. The reaction gives easy access to oxindole-fused spirotetrahydrofurochromans in moderate to good yields with high regio- and diastereoselectivity. These compounds could be useful for for drug discovery
A novel multicomponent quadruple/double quadruple domino reaction: highly efficient synthesis of polyheterocyclic architectures
作者:Manickam Bakthadoss、Srinivasan Jayakumar、Selvakumar Raman、Anthonisamy Devaraj、Duddu S. Sharada
DOI:10.1039/c8ob02970a
日期:——
A novel multicomponent quadruple domino reaction (MCQDR) for the assembly of structurally complex molecular architectures via the formation of three rings and three contiguous stereogenic centers has been accomplished with high regio- and diastereoselectivity. Solvents, catalysts and work-up were not required to obtain the target molecules. In addition, this new protocol is also extended for the multicomponent