Fig. 3: Synthesis of the common intermediate 8.

m-CPBA 3-chloroperoxybenzoic acid, NaHMDS sodium bis(trimethylsilyl)amide, THF tetrahydrofuran, LDA lithium diisopropylamide, BHT 2,6-di-tert-butyl-4-methylphenol, MB methylene blue, TBSOTf tert-butyldimethylsilyl trifluoromethanesulfonate, DIPEA N, N-diisopropylethylamine, IBX 2-iodoxybenzoic acid, DMSO dimethyl sulfoxide, DMP Dess–Martin periodinane, TMSCHN2 (trimethylsilyl)diazomethane, Me-CBS 5,5-diphenyl-2-methyl-3,4-propano-1,3,2-oxazaborolidine.