反应详情

Slow addition of a solution of ethyl 2-chloro-2-oxoacetate (4.69 g, 34.4 mmol) in THF (30 ml) to a solution of 1-(4-amino-2-methylphenoxy)-2-methylpropan-2-ol (6.10 g, 31.2 mmol) in THF (100 mL) resulted in formation of a precipitate as the reaction stirred at RT for 30 min. At which time a solution of Et3N (13.06 mL, 94 mmol) and 2,2-dimethoxyethanamine (3.94 g, 37.5 mmol) in EtOAc (100 mL) was added prior to heating the mixture at reflux for 25 hours. After cooling and concentration under vacuum, the residue, following dilution with CH2Cl2, was extracted with aqueous 0.5 N HCl (2×150 ml). The CH2Cl2 layer was dried over sodium sulfate and concentrated to yield N1-(2,2-dimethoxyethyl)-N2-(4-(2-hydroxy-2-methylpropoxy)-3-methylphenyl)-oxalamide (11.40 g, 30.6 mmol, 98% yield) as white solid which was carried forward without further purification.

1. customresulted in formation of a precipitate as the reaction
2. temperatureto heating the mixture
3. temperatureat reflux for 25 hours
4. temperatureAfter cooling
5. concentrationconcentration under vacuum
6. extractionwas extracted with aqueous 0.5 N HCl (2×150 ml)
7. dry with materialThe CH2Cl2 layer was dried over sodium sulfate
8. concentrationconcentrated