Sodium triacetoxyborohydride → (+/-)-6-({[(trans-4-fluoro-1-{2-[3-fluoro-6-(methyloxy)-1,5-naphthyridin-4-yl]ethyl}-3-pyrrolidinyl)methyl]amino}methyl)-2H-pyrido[3,2-b][1,4]thiazin-3(4H)-one

Participants

Reaction Steps

To a stirred solution of (±)-[(trans-4-fluoro-1-{2-[3-fluoro-6-(methyloxy)-1,5-naphthyridin-4-yl]ethyl}-3-pyrrolidinyl)methyl]amine (0.25 g, 0.77 mmole) in dry CH2Cl2 (25 mL) and dry EtOH (10 mL) at RT was added 3-oxo-3,4-dihydro-2H-pyrido[1,4]thiazine-6-carboxaldehyde (0.15 g, 0.77 mmole). After 24 h, at RT was added NaBH(OAc)3 (0.24 g, 1.15 mmole). After 2 h, the reaction solution was concentrated under vacuum and purified on silica (CHCl3/MeOH, 9:1 containing 5% NH4OH) to afford the title compound (0.23 g, 60%) as light yellow solid: 1H NMR (400 MHz, CD3OD) δ 8.75 (s, 1H), 8.25 (d, J=9.1 Hz, 1H), 7.83 (d, J=7.8 Hz, 1H), 7.25 (d, J=9.1 Hz, 1H), 7.15 (d, J=7.8 Hz, 1H), 4.43 (s, 2H), 4.19 (s, 3H), 3.90 (m, 2H), 3.77 (m, 4H), 3.65 (m, 4H), 3.57 (m, 2H), 3.32 (app s, 2H). LC-MS (ES) m/e 501 (M+H)+.

Provenance & Evidence