反应详情

温度

60 °C

To a stirred solution of 8-phenyl-1,4-dioxa-spiro[4.5]decane-8-carbonitrile (264) (1.5 g, 5.83 mmol) in ethanol (30 mL) was added NH2OH (50% aqueous solution, 1.1 mL, 17.49 mmol) and the reaction mixture was heated at 60° C. for 16 h. Silica thin layer chromatography was performed (ethyl acetate:Hexane=1:1, Rf=0.15). The reaction mixture was concentrated in vacuo to yield a crude mixture which was triturated with diethyl ether to obtain pure N-hydroxy-2-(8-phenyl-1,4-dioxa-spiro[4.5]dec-8-yl)-acetamidine (266) (850 mg, 50.22%) as an off-white solid which was used in the next step without further purification.

1. concentrationThe reaction mixture was concentrated in vacuo
2. customto yield a crude mixture which
3. customwas triturated with diethyl ether