Tetrahydrofuran → 2-Nitro-5-[4-(1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-1,2,3-triazol-4-yl)phenyl]thiophene-3-carboxamide

Participants

Reaction Conditions

Reaction Steps

5-Bromo-2-nitrothiophene-3-carboxamide (Intermediate 10 Step 4) (470 mg, 1.87 mmol), 4-[4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-1,2,3-triazole (751 mg, 1.87 mmol), and Pd(PPh3)4 (108 mg, 0.094 mmol) were combined in a vial and evacuated/backfilled with nitrogen. THF (4.4 mL) and 2 N Na2CO3 (1.9 mL) were added. The reaction mixture was heated to 90° C. overnight. The black reaction was diluted with water and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried (MgSO4), filtered, combined with silica, and evaporated. Flash chromatography (dry load, 50-100% EtOAc/hexanes) afforded a brown solid that was triturated with CH2Cl2 and filtered to isolate the title compound as a yellow solid. The mother liquor was concentrated, triturated again, and filtered to isolate an additional batch of the title compound.

Provenance & Evidence