反应详情

2H-Indazole-5-carbaldehyde (Stage 150.5, 770 mg, 5.27 mmol) was dissolved in THF (54 mL) and dicyclohexylmethylamine (1.37 mL, 6.32 mmol) was added. After dropwise addition of (2-chloromethoxy-ethyl)-trimethyl-silane (1.21 mL, 6.32 mmol), the RM was stirred for 48 h at rt. It was then taken into EtOAc and washed successively with 0.5 M aqueous NaOH solution and brine. The organic layer was dried on Na2SO4 and evaporated and the residue purified by flash chromatography (CombiFlash® Companion System®, with RediSep® silica gel column, n-hexane/EtOAc=100:0->70:30) to afford white crystals of the title compound (tR 7.14 min (conditions 3), MH+=277).

1. washwashed successively with 0.5 M aqueous NaOH solution and brine
2. customThe organic layer was dried on Na2SO4
3. customevaporated
4. customthe residue purified by flash chromatography (CombiFlash® Companion System®, with RediSep® silica gel column, n-hexane/EtOAc=100:0->70:30)