HCID 13812516, compound → HCID 59567461, compound

Participants

Reaction Steps

To a solution of (S)-3-(tert-butyl-dimethyl-silanyloxy)-2-isocyanato-2-methyl-propionic acid methyl ester (510 mg, 1.86 mmol) in dry DMSO (1.5 mL) was added 5-diazoimidazole-4-carboxamide (135 g, 0.98 mmol) at room temperature under nitrogen. The reaction mixture was stirred for 2 hours whereupon it was poured onto crushed ice. The resultant white precipitate was collected by vacuum filtration. The filter cake was washed with water (2×1 reaction volume), EtOAc (1 reaction volume) and then Et2O (1 reaction volume) to give (S)-3-(tert-Butyl-dimethyl-silanyloxy)-2-(8-carbamoyl-4-oxo-imidazo[5,1-d][1,2,3,5]tetrazin-3-yl)-2-methyl-propionic acid methyl ester as a pale off white solid (140 mg, 34%). 1H NMR (400 MHz, d6-DMSO) δ ppm: 8.96 (CH, s, 1H), 7.91 (CONH2, s, 1H), 7.77 (CONH2, s, 1H), 5.77 (CH, dd, J=8.8 Hz, 5.6 Hz, 1H), 4.36 (CH2, dd, J=10.6 Hz, 5.6 Hz, 1H), 4.23 (CH2, dd, J=10.6 Hz, 8.8 Hz, 1H), 3.72 (CO2CH3, s, 3H), 0.72 (SiC(CH3)3, s, 9H), 0.03 (SiCH3, s, 3H), −0.06 (SiCH3, s, 3H).

Provenance & Evidence