Trimethylsilylacetylene → N,N-di(1,1-dimethylethoxycarbonyl)-3-(1-(2,3-difluorophenyl)-1H-tetrazol-5-yl)-5-(2-(trimethylsilyl)ethynyl)pyridin-2-amine

Participants

Reaction Conditions

Reaction Steps

In a tube was placed N,N-di(1,1-dimethylethoxycarbonyl)-3-(1-(2,3-difluorophenyl)-1H-tetrazol-5-yl)-5-bromopyridin-2-amine (2.3 g, 4.1 mmol) in diethylamine (10 mL) with ethynyltrimethylsilane (1.5 g, 15.3 mmol) and the reaction was deoxygenated with a stream of nitrogen gas. To the mixture was added copper(I) iodide (554 mg, 2.9 mmol). The reaction vessel was sealed and warmed to 50° C. to achieve dissolution. To the mixture was added PdCl2dppf2.CH2Cl2 (190 mg, 0.06 eq). The reaction vessel was sealed and the mixture sonicated at 50° C. for 10 minutes. The reaction was diluted with methylene chloride, filtered through Celite™, concentrated, and purified by silica gel chromatography (10% ethyl acetate/hexane to 50% ethyl acetate/hexane) to give N,N-di(1,1-dimethylethoxycarbonyl)-3-(1-(2,3-difluorophenyl)-1H-tetrazol-5-yl)-5-(2-(trimethylsilyl)ethynyl)pyridin-2-amine (713 mg, 1.2 mmol, 30%) as a yellow solid; LC-MS: m/e=471.3 [M-Boc+H].

Provenance & Evidence