1,4-Dioxane → HCID 68777387, compound

Participants

Reaction Conditions

Reaction Steps

4-Fluoro-1-(3-methyl-butylamino)-1H-pyrrole-2-carboxylic acid allyl ester (Example 14g, 0.24 g, 0.944 mmol) was dissolved in anhydrous 1,4-dioxane (10 mL) and methyl malonyl chloride was added under a nitrogen atmosphere. The reaction mixture was heated to 100° C. for 1 h. Upon cooling to 25° C., saturated aqueous sodium bicarbonate solution was added and the product was extracted with 50% ethyl acetate/hexanes. The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to afford the crude desired product, 1-[(2-ethoxycarbonyl-acetyl)-(3-methyl-butyl)-amino]-4-fluoro-1H-pyrrole-2-carboxylic acid allyl ester (0.335 g, 0.944 mmol, 100% yield) as a pale yellow oil, which was used in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ: 0.90 (3H, d, J=4.6 Hz), 0.92 (3H, d, J=5.2 Hz), 1.37-1.46 (1H, m), 1.54-1.64 (1H, m), 1.69-1.78 (1H, m), 3.13 (2H, d, J=3.1 Hz), 3.70 (3H, s), 4.16-4.26 (2H, m), 4.73 (2H, d, J=5.5 Hz), 5.28-5.31 (1H, m), 5.37 (1H, dd, J1=17.2 Hz, J2=1.6 Hz), 5.91-6.01 (1H, m), 6.69-6.76 (2H, m).

Provenance & Evidence