作者:Hongmiao Wu、Bin Yang、Lin Zhu、Ronghua Lu、Guigen Li、Hongjian Lu
DOI:10.1021/acs.orglett.6b02706
日期:2016.11.18
An oxy-palladation, formal Wagner–Meerwein rearrangement and fluorination cascade has been established for generating fluorinated oxazolidine-2,4-diones and oxazolidin-2-ones. The reaction has a broad substrate scope in which both aryl and alkyl groups can be utilized as efficient migrating groups. Experimental evidence suggests that the reaction is initiated by anti-oxy-palladation of the olefin,
non‐activated aliphatic C−Fbond in which a conceptually new desymmetrization of 1,3‐difluorides by silicon‐induced selectiveC−Fbond scission is a key step. The combination of a cinchona alkaloid based chiral ammonium bifluoride catalyst and N,O‐bis(trimethylsilyl)acetoamide (BSA) as the silicon reagent enabled the efficient catalytic cycle of asymmetric Csp3−F bond cleavage undermildconditions with high enantioselectivities