An efficient one-potsynthesis of 2H-pyranonaphthoquinone was achieved via a palladium-catalyzed C–H bondactivation/C–Cbond formation/intramolecular Tsuji–Trost reaction cascade. The unprecedented procedure exhibits excellent functional group tolerance, giving the target naphthoquinones in moderate to good isolated yields (40–88%) under mild reaction conditions. Scalable production of the product
Rh(I)/Bisoxazolinephosphine-Catalyzed Regio- and Enantioselective Allylic Substitutions
作者:Wen-Bin Xu、Samir Ghorai、Wenyu Huang、Changkun Li
DOI:10.1021/acscatal.0c00712
日期:2020.4.17
Rhodium(I)/bisoxazolinephosphine combination has been developed as a general catalyst to achieve the dynamic kinetic asymmetric allylation of a variety of nitrogen, carbon, oxygen, and sulfur pronucleophiles from branched racemic allylic carbonates. Exclusive branch-selectivity and up to 99% enantiomeric excess could be obtained under neutral conditions. Linear allylic substrates (both Z and E) could
The Fe-Catalysed Phosphono-Allylation of Activated Olefins
作者:Susanne Rommel、André P. Dieskau、Bernd Plietker
DOI:10.1002/ejoc.201201563
日期:2013.3
under thermal conditions. The preparation of more densely functionalized phosphonates is still a synthetic challenge. In this paper, we present a convenient one-pot three-component phosphono-allylation of activatedolefins to give phosphonates bearing a variety of functional groups.
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
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