Improved Method for the Synthesis of β-Carbonyl Silyl-1,3-Dithianes by the Double Conjugate Addition of 1,3-Dithiol to Propargylic Carbonyl Compounds
作者:Sumit Mukherjee、Dimitra Kontokosta、Aditi Patil、Sivakumar Rallapalli、Daesung Lee
DOI:10.1021/jo901950e
日期:2009.12.4
Base-mediated double Conjugate addition of 1,3-propane dithiol to various silylated propargylic aldehydes and ketones allows for an efficient and scalable synthesis of beta-carbonyl silyl-1,3-dithianes.
Anion Relay Chemistry: Development of an Effective Diastereoselective [3+2] Annulation Tactic Exploiting an Aldol/Brook Rearrangement/Cyclization Cascade
作者:Heeoon Han、Amos B. Smith
DOI:10.1002/anie.201708017
日期:2017.11.6
An effective [3+2] annulation tactic for the construction of diverse bicyclic compounds possessing highly functionalized cyclopentane rings has been developed employing soft ketone enolates as the initial nucleophile for anion relay chemistry (ARC). The protocol entails a highlydiastereoselective aldol/Brook rearrangement/cyclization cascade.
Merging Asymmetric [1,2]-Additions of Lithium Acetylides to Carbonyls with Type II Anion Relay Chemistry
作者:Kevin T. O’Brien、Amos B. Smith
DOI:10.1021/acs.orglett.9b02959
日期:2019.9.20
union of a variety of lithium acetylides and electrophiles exploiting an achiral linchpin via an anionic reaction cascade. This Type II AnionRelayChemistry tactic is initiated via an enantioselective [1,2]-carbonyl addition exploiting BINOL catalysis to access an enantioenriched alkoxide intermediate. Migration of charge across the linchpin via a [1,4]-Brook rearrangement with electrophile capture