1,1'-Carbonyldiimidazole → tert-butyl 3-(3-(methoxy(methyl)amino)-3-oxopropyl)-3,4-dihydroisoquinoline-2(1H)-carboxylate

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Reaction Steps

A solution of 3-(2-(tert-butoxycarbonyl)-1,2,3,4-tetrahydroisoquinolin-3-yl)propanoic acid (7.7 g, 25.2 mmol) in dichloromethane (200 mL, 0.13 M) was treated with CDI (6.1 g, 37.8 mmol) in three portions over 10 min with vigorous stirring. After the addition was complete, the mixture was stirred for an additional 40 min and treated with N,O-dimethylhydroxylamine hydrochloride (3.7 g, 37.2 mmol) and stirred overnight. The resulting solution was washed successively with water, 1 M HCl, 1 M NaOH, sat'd aq sodium chloride, dried over anhydrous MgSO4, filtered and concentrated to give tert-butyl 3-(3-(methoxy(methyl)amino)-3-oxopropyl)-3,4-dihydroisoquinoline-2(1H)-carboxylate as a yellow oil (8.6 g, 98%). LCMS, C19H28N2O4 m/z [371.4 (M+23)]. The crude product was used without further purification.

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