N-Methyl-N-(tert-butyldimethylsilyl)trifluoroacetamide → 8-[(6-Bromopyridin-2-yl)-(tert-butyldimethylsiloxy)methyl]-10-methoxymethyl-10H-pyrazino[2,3-b][1,4]benzothiazine

Participants

Reaction Steps

To a solution of 1.05 g of (10-methoxymethyl-10H-pyrazino[2,3-b][1,4]benzothiazin-8-yl)-(6-bromopyridin-2-yl)methanol in 15 ml of acetonitrile was added in a nitrogen atmosphere 3.2 ml of N-(tert-butyldimethylsilyl)-N-methyltrifluoroacetamide and the resulting mixture was stirred at room temperature for 22 hours. After distilling off the solvent under reduced pressure, the residue was purified by silica gel column chromatography (eluted with n-hexane/ethyl acetate) to thereby give 0.72 g of the title compound as a yellow solid.

Provenance & Evidence