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The reaction of ortho-alkynylaryl aldimines and indoles catalyzed by a silver binol-derived phosphate was realized to afford a series of enantioenriched 1,2-dihydroisoquinolines in moderate to good yields and ee. An interesting phenomenon that highly enantioenriched products could be obtained from their lower ee form by silica gel column chromatography was observed, providing an easy access to the...
New asymmetric total syntheses of (–)‐dichotomines A–D (1–4) starting from L‐tryptophan methyl ester and 2,3‐O‐isopropylidene‐D‐glyceraldehyde are described. The absolute configuration of the stereogenic center of (–)‐dichotomine A (1) was reconfirmed as (S), on the basis of the X‐ray crystallographic analysis of the conjugate (i.e., 17) of its methyl ester (i.e., 16) with (S)‐N‐tosylproline, whereas...
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