(R)-2-(5-methylisoxazol-3-yl)but-3-yn-2-ol → methyl 9-[(3R)-3-hydroxy-3-(5-methylisoxazol-3-yl)but-1-ynyl]-4,5-dihydro-[1]benzoxepino[5,4-d]thiazole-2-carboxylate

Participants

Reaction Steps

Methyl 9-bromo-4,5-dihydro-[1]benzoxepino[5,4-d]thiazole-2-carboxylate (0.2 g) was reacted with (2R)-2-(5-methylisoxazol-3-yl)but-3-yn-2-ol similar to as described in Procedure F but substituting CuI for ZnBr and Dioxane as the solvent to afford 70 mg of methyl 9-[(3R)-3-hydroxy-3-(5-methylisoxazol-3-yl)but-1-ynyl]-4,5-dihydro-[1]benzoxepino[5,4-d]thiazole-2-carboxylate following reverse phase hplc purification. MS (Q1) 411.2 (M)+. Methyl 9-[(3R)-3-hydroxy-3-(5-methylisoxazol-3-yl)but-1-ynyl]-4,5-dihydro-[1]benzoxepino[5,4-d]thiazole-2-carboxylate (70 mg) was saponified with LiOH in THF/water followed by similar to as described in Example 2 to afford 39.7 mg of 9-[(3R)-3-hydroxy-3-(5-methylisoxazol-3-yl)but-1-ynyl]-4,5-dihydro-[1]benzoxepino[5,4-d]thiazole-2-carboxamide following reverse phase hplc purification. MS (Q1) 396 (M)+. 1H NMR (400 MHz, DMSO) δ 8.60 (d, J=2.1 Hz, 1H), 8.42 (s, 1H), 7.85 (s, 1H), 7.31 (dd, J=8.3, 2.2 Hz, 1H), 7.04 (d, J=8.3 Hz, 1H), 6.46 (s, 1H), 6.36 (s, 1H), 4.35 (t, J=4.9 Hz, 2H), 3.41 (t, J=4.9 Hz, 2H), 2.41 (s, 3H), 1.81 (s, 3H).

Provenance & Evidence