The synthesis of non-racemic β-alkyl-β-aryl-disubstituted allyl alcohols and their transformation into allylamines and amino acids bearing a quaternary stereocenter
synthesis of non-racemic β-alkyl-β-aryl allyl alcohols and their transformation into allylamines bearing a quaternary stereogenic center is reported. The allyl alcohols were prepared either by Cu-catalyzed enantioselective reduction of enones or by sequential alkylation/hydrostannylation/Stille coupling of non-racemic propargyl alcohols. The prepared β-alkyl-β-aryl allyl alcohols were converted (after carbamoylation)
Development of a palladium catalyzed addition of boronic acids to alkynyl esters: synthesis of trisubstituted olefins as single isomers
作者:Alexander Graham Bush、Jojo Liu Jiang、Philippa R. Payne、William W. Ogilvie
DOI:10.1016/j.tet.2009.08.029
日期:2009.10
Very small phosphine ligands allow access to single isomer trisubstituted olefins from alkynyl esters with complete control of both stereochemistry and regiochemistry. This method provides a convenient synthesis of single isomer trisubstituted olefins without requiring olefin templates.
Ir-Catalyzed Asymmetric Allylic Alkylation of Dialkyl Malonates Enabling the Construction of Enantioenriched All-Carbon Quaternary Centers
作者:Farbod A. Moghadam、Elliot F. Hicks、Zachary P. Sercel、Alexander Q. Cusumano、Michael D. Bartberger、Brian M. Stoltz
DOI:10.1021/jacs.2c02960
日期:2022.5.11
An enantioselective iridium-catalyzed allylicalkylation of malonates with trisubstituted allylic electrophiles to form all-carbon quaternary stereocenters is reported. This reaction proceeds at ambient temperature and enables the preparation of a wide range of enantioenriched products in up to 93% yield and 97% ee. The quaternary products can be readily converted to several valuable building blocks
报道了丙二酸酯与三取代的烯丙基亲电子试剂形成全碳季立构中心的对映选择性铱催化的烯丙基烷基化。该反应在环境温度下进行,能够以高达 93% 的产率和 97% 的 ee 制备范围广泛的对映体富集产品。季产品可以很容易地转化为几种有价值的结构单元,例如邻位季产品和 β-季酸。