Design and Synthesis of Highly Potent Benzodiazepine γ-Secretase Inhibitors: Preparation of (2S,3R)-3-(3,4- Difluorophenyl)-2-(4-fluorophenyl)-4- hydroxy-N-((3S)-1-methyl-2-oxo-5- phenyl-2,3-dihydro-1H-benzo[e][1,4]- diazepin-3-yl)butyramide by Use of an Asymmetric Ireland−Claisen Rearrangement

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Abstract
Novel benzodiazepine-containing γ-secretase inhibitors for potential use in Alzheimer's disease have been designed that incorporate a substituted hydrocinnamide C-3 side chain. A syn combination of α-alkyl or aryl and β-hydroxy or hydroxymethyl substituents was shown to give highly potent compounds. In particular, (2S,3R)-3-(3,4-difluorophenyl)-2-(4-fluorophenyl)-4-hydroxy-N-((3S)-2-oxo-5-phenyl-2,3-dihydro-1H-benzo[e][1,4]diazepin-3-yl)butyramide (34) demonstrated excellent in vitro potency (IC50 = 0.06nM). 34 could also be selectively methylated to give [3H]-28, which is of use in radioligand binding assays.