Asymmetric Synthesis of Iridoid Derivatives Using Resolved 2-Phenylindoline as a Chiral Auxiliary
作者:Ellen M. Santangelo、Ilme Liblikas、Anoma Mudalige、Karl W. Törnroos、Per-Ola Norrby、C. Rikard Unelius
DOI:10.1002/ejoc.200800440
日期:2008.12
isocyanate, followed by reductive cleavage of the isolated diasteromers using diborane. The cycloaddition of oxocitral using (S)-2-phenylindoline yielded an enantiopure product after chromatography. Hydrolysis of the cycloaddition adduct yielded gastrolactol (3). As gastrolactol is a versatile synthon for the synthesis of iridoids, the overall procedure provides a general asymmetric route to elaborated iridoids