A Substrate-Based Folding Process Incorporating Chemodifferentiating ABB′ Three-Component Reactions of Terminal Alkynoates and 1,2-Dicarbonyl Compounds: A Skeletal-Diversity-Oriented Synthetic Manifold
reaction (3CR)-based folding process that is able to generate complexity and skeletal diversity is described. The process utilizes chemodifferentiating organocatalyzed ABB' 3CRs of a terminal conjugated alkynoate (building block) with alpha-dicarbonyl compounds (diversity-generating blocks) to generate an array of different molecular topologies (gamma-lactones, linear propargylic enol ethers, or 1,3-dioxolane
α-Keto amides were dimerized in the presence of SmI2 in THF to give substituted tartaric amides in moderate to good yields. Although the dimerization of the secondary keto amides did not proceed stereoselectively, racemic tartaric amides were produced exclusively in the case of the tertiary keto amides.
We describe the use of tetrabutylammonium fluoride as a basic trigger for reactions capable of generating structurally diverse products from methyl propiolate and carbonyl derivatives. The processes are based on either chemodifferentiating multicomponent ABB' three-component reactions or bimolecular dominoreactions, and they operate through three different and well-defined autocatalytic cycles. These
A methylene group was introduced into the C–H bond of α-carbonyl aldonitrones by the reaction with dimethylsulfoxonium methylide, producing one-carbon homologated C-methyl ketonitrones. This formal methylene insertion was applied to one-pot synthesis of quaternary C3-methyl isoxazolidines via successive 1,3-dipolar cycloaddition with alkenes bearing an electron withdrawing group.