Diastereodivergent Reverse Prenylation of Indole and Tryptophan Derivatives: Total Synthesis of Amauromine, Novoamauromine, and <i>epi</i>
-Amauromine
作者:Jonas M. Müller、Christian B. W. Stark
DOI:10.1002/anie.201509468
日期:2016.4.4
A regio‐ and stereoselective reverse prenylation of indole and tryptophan derivatives is presented. All four possible stereoisomers are accessible through this iridium‐catalyzed reaction. The stereoselectivity is controlled by a chiral phosphoramidite ligand in combination with an achiral borane additive and can be switched by changing the nature of the borane. One enantiomer of the ligand is thus
AgNTf<sub>2</sub>-Mediated Allylation with Allylsilanes at C3<i>a</i>-Position of Hexahydropyrroloindoles: Application to Total Syntheses of Amauromine Alkaloids
various allyl groups including the reverse prenyl group. The utility of this reaction is demonstrated by total synthesis of amauromine alkaloids. Stepwise bromocyclizations of the bis-indolylmethyl diketopiperazine derivative and subsequent double reverse prenylation furnished (+)-novoamauromine and (−)-epiamauromine.