80595-59-1Relevant articles and documents
Asymmetric Wittig reaction of chiral arsonium ylides - I. Asymmetric olefination of 4-substituted cyclohexanones
Dai, Wei-Min,Wu, Jinlong,Huang, Xian
, p. 1979 - 1982 (1997)
Asymmetric Wittig-type olefination of 4-substituted cyclohexanones with chiral ligand-modified stable arsonium ylides has been examined. The 8-phenylmenthol-derived chiral arsonium ylide of 4 reacted with prochiral ketones 9a-d at -15°C to give the 4-substituted cyclohexylideneacetates 11a-d in 58-69% yield and in up to 80% diastereomeric excess (de).
Exceptionally mild, high-yield synthesis of α-fluoro acrylates
Zajc, Barbara,Kake, Shivani
, p. 4457 - 4460 (2007/10/03)
Novel achiral and chiral alkyl α-(1,3-benzothiazol-2-ylsulfonyl)- α-fluoroacetates can be readily synthesized by metalation-fluorination of (1,3-benzothiazol-2-ylsulfonyl)acetates. DBU-mediated condensations of these fluorinated synthons with aldehydes proceed in a facile manner at 0 °C or at room temperature giving high yields of α-fluoro acrylates. Ketones are unreactive under these conditions. The presence of fluorine renders the synthon substantially more reactive compared to the unfluorinated analogue. Reactivity of α-(1,3-benzothiazol-2-ylsulfonyl)-α-fluoroacetate and the Horner-Wadsworth-Emmons reagent (EtO)2P(O)CHFCOOEt has also been compared.
Remarkable examples of double diastereodifferentiation: Application to the eudistomin and eudistomidin alkaloids
Polniaszek, Richard P.,Bell, Stephanie J.
, p. 575 - 578 (2007/10/02)
Nucleophilic addition of chiral enolates 1 and ent-1 with chiral iminium ion 2a occur with total stereochemical control.