Diisopropylamine → 5-Chloro-7-(3-methoxyprop-1-ynyl)-1,3-benzodioxol-4-amine

Participants

Reaction Steps

Bis(Triphenyl-phosphine)palladium(II) chloride (472 mg), copper iodide (192 mg) and diisopropylamine (680 mg) were added to a stirred solution of 5-chloro-7-iodo-1,3-benzodioxol-4-amine (1000 mg) and methyl propargyl ether (471 mg) in ethyl acetate (10 mls) at −20° C. The reaction was allowed to warm to ambient temperature over 16 hours. The reaction mixture was partitioned between Ethyl acetate and saturated NaHCO3. The organics were washed with water and saturated brine and dried over magnesium sulfate. The product was purified by column chromatography on silica using a gradient of 80-100% Dichloromethane/isohexane as eluent. The 5-chloro-7-(3-methoxyprop-1-ynyl)-1,3-benzodioxol-4-amine product was thus obtained as a tan crystalline solid (200 mg); NMR Spectrum: (DMSOd6) 3.28 (s, 3H), 4.26 (s, 2H), 5.52 (s, 2H), 6.05 (s, 2H), 6.93 (s, 1H).

Provenance & Evidence