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In a 500 ml reaction flask, tert-butyl 2-methylsulfonamidoethylaminoformate (25 g) and 350 ml of a mixture of ethanol and methanol were added. The mixture was stirred by an electromagnetic stirrer, fed with dry hydrogen chloride gas for 3 h, stirred at room temperature overnight, concentrated under a reduced pressure to a small volume, subjected to suction filtration to obtain 14.6 g of brown-gray powdery solid, yield 79.3%.

1. additionwere added
2. stirringstirred at room temperature overnight
3. concentrationconcentrated under a reduced pressure to a small volume
4. filtrationsubjected to suction filtration