(2-Aminoethoxy)(tert-butyl)dimethylsilane → (S)-N1-(2-(tert-butyldimethylsilyloxy)ethyl)-3-methyl-N2-(3-(4-(1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-2-yl)phenyl)pyrazolo[1,5-a]pyrimidin-5-yl)butane-1,2-diamine

Participants

Reaction Steps

To a stirred solution of (S)-3-methyl-2-(3-(4-(1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-2-yl)phenyl)pyrazolo[1,5-a]pyrimidin-5-ylamino)butanal (27 mg, 0.055 mmol) in DCE (1 mL) was added a solution of 2-(tert-butyldimethylsilyloxy)ethanamine (29 mg, 0.17 mmol) in THF (0.2 mL). The reaction was allowed to stir at ambient temperature for 15 minutes, at which point Na(OAc)3BH was added and the reaction allowed to stir at ambient temperature for 2 hours. The reaction mixture was partitioned between saturated aqueous NaHCO3 and dichloromethane. The aqueous layer was extracted with dichloromethane. The combined extracts were washed with brine, dried and concentrated to give (S)—N1-(2-(tert-butyldimethylsilyloxy)ethyl)-3-methyl-N2-(3-(4-(1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-2-yl)phenyl)pyrazolo[1,5-a]pyrimidin-5-yl)butane-1,2-diamine. The crude was used in the next step without further purification. LCMS (APCI+) m/z 650.9 [M+H]+.

Provenance & Evidence