Diisopropylethylamine → (R)-N-[(3S,6R)-6-(tert-butyl-dimethyl-silanyloxy)2-oxo-1-pyridin-3-ylmethyl-azepan-3-yl]-2-[(4R,5R,6R)-6-((E)-3,3-dimethyl-but-1-enyl)-5-hydroxy-2,2-dimethyl-[1,3]dioxan-4-yl]-2-methoxy-acetamide

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Reaction Steps

A solution of (3S,6R)-3-amino-6-(tert-butyl-dimethyl-silanyloxy)-1-pyridin-3-ylmethyl-azepan-2-one (1.84 g, 5.3 mmol), (4R,4aR)-4-((E)-3,3-Dimethyl-but-1-enyl)-7-methoxy-2,2-dimethyl-tetrahydro-furo[3,2-d][1,3]dioxin-6-one (1.0 g, 3.5 mmol) and diisopropylethylamine (1.37 g, 11.0 mmol) in isopropanol (10 mL) is refluxed for 16 h. The solution is evaporated and chromatographed on silica (95% CH2Cl2/5% CH3OH) to give 1.27 g (57.0%) of (R)-N-[(3S,6R)-6-(tert-butyl-dimethyl-silanyloxy)2-oxo-1-pyridin-3-ylmethyl-azepan-3-yl]-2-[(4R,5R,6R)-6-((E)-3,3-dimethyl-but-1-enyl)-5-hydroxy-2,2-dimethyl-[1,3]dioxan-4-yl]-2-methoxy-acetamide as a white solid. MS (ESI) 634.3 (M+H)+

Provenance & Evidence