Exercising Regiocontrol in Palladium-Catalyzed Asymmetric Prenylations and Geranylation: Unifying Strategy toward Flustramines A and B
摘要:
Pd-catalyzed asymmetric prenylation of oxindoles to afford selectively either the prenyl or reverse-prenyl product has been demonstrated. Control of the regioselectivity in this transformation is governed by the choice of ligand, solvent, and halide additive. The resulting prenylated and reverse-prenylated products were transformed into ent-flustramides and ent-flustramines A and B. Additionally, control of the regio- and diastereoselectivity was obtained using pi-geranylpalladium complexes.
Development of the Regiodivergent Asymmetric Prenylation of 3‐Substituted Oxindoles
作者:Barry M. Trost、Walter H. Chan、Sushant Malhotra
DOI:10.1002/chem.201605810
日期:2017.3.28
oxindoles that affords access to both the linear and reverse‐prenylated products. Both 3‐alkyl‐ and 3‐aryloxindoles performed well under our optimized reaction conditions. The regiodivergent alkylation of monoterpene‐derived electrophiles using this methodology was also investigated. The utility of this methodology in naturalproduct synthesis was demonstrated through the efficient total syntheses of four