Water → HCID 13324761, compound

Participants

Reaction Steps

An ice cold rapidly stirred solution of 7.73 g (28.18 mmole) of 3-(1-indolinyl)-N-methyl benzenemethanamine hydrochloride of Example 8b in 150 ml CH2Cl2 was treated dropwise with a solution of 9.9 ml (70.45 mmole, 2.5 equivalents) of triethylamine in 10 ml CH2Cl2. After stirring for three minutes, a solution of 4.0 ml (42.27 mmole, 1.5 equivalents) ethyl chloroformate in 10 ml CH2Cl2 was added dropwise. At the end of the addition the reaction mixture was permitted to warm to room temperature, stirred for 1 hour and stand about 64 hours. Water (200 ml) was added and the organic layer was separated and washed with 2 N HCl (200 ml), water (300 ml), brine (300 ml), dried (Na2SO4), and concentrated to give 7.64 g (87.3%) of crude product. Chromatography on silica gel (85 g) using ether-methylene chloride afforded 6.73 g (76.9% overall) of an oil of N-ethoxycarbonyl-3-(1-indolinyl)-N-methylbenzenemethanamine, bp>240° C./0.1 mm.

Provenance & Evidence