反应详情

Prepared from 5-(4-Methyl-5-trifluoromethyl-isoxazol-3-yl)-thiophene-2-carboxylic acid and 4-N-Boc-2-(R)-hydroxymethyl-piperazine by the method described in Example 2 Method B. The reaction mixture was evaporated to a solid, triturated and filtered with the aid of water, then washed with a 1 N aqueous hydrochloric acid solution followed by water. The solid was air dried afford intermediate N-Boc protected product as a colorless solid (102 mg, 86%). The Boc-protected intermediate was dissolved in a 4 N solution of hydrogen chloride in 1,4-dioxane (2 mL) and stirred for 2 hr, after which time the reaction mixture was evaporated to approximately ¼ volume and diluted with ethyl ether (4 mL). The resulting solids were filtered and air dried to afford product as a colorless solid (85 mg, 83% overall). 1H NMR (D2O) 2.17 (s, 3 H), 3.26-3.46 (m, 3 H), 3.60-3.80 (m, 3 H), 4.00-4.04 (m, 1 H), 4.48 (dd, J=12.7, 5.3, 1 H), 4.60 (obs dd, J=13.2, 3.5, 1 H), 7.46 (d, J=4.3, 1 H), 7.82 (d, J=4.0, 1 H). 19F NMR −63.5. LC/MS 3.89 min, [M+1]+ 376.

1. customThe reaction mixture was evaporated to a solid
2. customtriturated
3. filtrationfiltered with the aid of water
4. washwashed with a 1 N aqueous hydrochloric acid solution
5. customdried
6. customafford intermediate N-Boc protected product as a colorless solid (102 mg, 86%)
7. customafter which time the reaction mixture was evaporated to approximately ¼ volume
8. additiondiluted with ethyl ether (4 mL)
9. filtrationThe resulting solids were filtered
10. customair dried