Phthalimide → 2-(2-Oxocyclohexyl)isoindole-1,3-dione

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반응 단계

The amine required as precursor was prepared in accordance with GB1131191. 2-Chlorocyclohexanone was reacted with phthalimide to give 2-(2-oxocyclohexyl)isoindole-1,3-dione, which was ketalized with ethylene glycol in the presence of para-toluenesulfonic acid, giving 2-(1,4-dioxaspiro[4.5]dec-6-yl)isoindole-1,3-dione. Treatment with hydrazine hydrate to remove the phthalimideradical gave the desired 1,4-dioxaspiro[4.5]dec-6-ylamine. b) 1-(1,4-Dioxaspiro[4.5]dec-6-yl)-3-(4-methylthiophen-3-yl)thiourea

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