tert-Butylsulfinamide, (S)-(-)- → (NE,S)-N-[1-(6-bromo-3-fluoro-4-triethylsilyl-2-pyridinyl)-3-methoxypropylidene]-2-methylpropane-2-sulfinamide

Participants

Reaction Conditions

Reaction Steps

A mixture of titantetraethoxide (11.03 g, 48.4 mmol), (S)-tert.-butylsulfinamide (3.52 g, 29 mmol) and 1-(6-Bromo-3-fluoro-4-triethylsilanyl-pyridin-2-yl)-3-methoxy-propan-1-one (9.1 g, 24.18 mmol) in THF (100 ml) was stirred at 60° C. under a nitrogen atmosphere for 34 hours. The cold reaction mixture was diluted with ethyl acetate and poured onto icecold brine (200 ml) with gentle stirring. The precipitate was filtered through a pad of hyflo and washed with ethyl acetate. The filtrate was diluted with ethyl acetate and washed with brine, dried over sodium sulfate, filtered and evaporated. The crude yellowish-brown oil (10.67 g) was chromatographed over silica gel (Redisep column 120 g, cyclohexane/ethyl acetate 95:5) to give the title compound as a yellow-orange oil. 7.51 g (63.5% yield).

Provenance & Evidence