2,2,6,6-Tetramethylpiperidine → N-(2-(1-(tert-butyldimethylsilyloxy)cyclobutyl)-1-(3-chloro-6-neopentylpyridazin-4-yl)ethyl)-2-methylpropane-2-sulfinamide

Participants

Reaction Conditions

Reaction Steps

2,2,6,6-Tetramethylpiperidine (0.68 ml, 4.0 mmol) was dissolved in 120 ml THF and 1-butyllithium (1.5 ml, 3.8 mmol) was added at −78° C. drop wise. The mixture was allowed to warm to 0° C. (over a period of 5 min) and kept there for 5 min. The mixture was cooled back to −78° C. and a solution of 3-chloro-6-neopentylpyridazine (0.45 g, 2.4 mmol) in 10 ml of THF was added drop wise. Stirring was continued for 20 min and a solution of (E)-N-(2-(1-(tert-butyldimethylsilyloxy)cyclobutyl)ethylidene)-2-methylpropane-2-sulfinamide (1.450 g, 4.4 mmol) in 5 ml THF was added drop wise. Stirring was continued for 10 min and the mixture was hydrolyzed with H2O. The mixture was extracted with EtOAc (3×300 ml) dried over MgSO4 and evaporated. The crude product was used in the next step without further purification.

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