反应详情

A solution of 7-iodo-5-triisopropylsilanyl-2-(3,4,5-trimethoxy-phenyl)-5H-pyrrolo[2,3-b]pyrazine (116 mg, 0.2 mmol) in anhydrous tetrahydrofuran (3 ml) was cooled to −78° C. and treated with nBuLi (2.13M in hexanes, 0.13 ml, 0.27 mmol) dropwise. The solution was stirred for 30 seconds and 1-methyl-cyclopropanecarboxylic acid methoxy-methyl-amide (88 mg, 0.61 mmol) was added in one portion. The reaction mixture was stirred at −78° C. for 30 minutes. The reaction mixture was quenched with saturated aqueous NaHSO4 and then partitioned between EtOAc/brine. The organic layers were collected, dried over MgSO4, filtered, and concentrated giving a yellow oil. The oil was purified by silica gel chromatography using 2-30% EtOAc in hexanes as eluant to provide 20 mg (19%) of (1-methyl-cyclopropyl)-[5-triisopropylsilanyl-2-(3,4,5-trimethoxy-phenyl)-5H-pyrrolo[2,3-b]pyrazin-7-yl]-methanone.

1. stirringThe reaction mixture was stirred at −78° C. for 30 minutes
2. customThe reaction mixture was quenched with saturated aqueous NaHSO4
3. custompartitioned between EtOAc/brine
4. customThe organic layers were collected
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customgiving a yellow oil
9. customThe oil was purified by silica gel chromatography