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The crude 2-(2,3 dihydrobenzo[1,4]dioxin-2-yl)ethylamine in dioxane (100 mL) was combined with sulfamide (3.0 g, 31 mmol) and heated to reflux for 2 h. The solution was cooled and evaporated in vacuo to yield an orange solid, which was purified by column chromatography (DCM:MeOH—10:1) to yield a white solid. The solid was re-crystallized from DCM to yield the title compound as a solid.

1. temperatureheated
2. temperatureto reflux for 2 h
3. temperatureThe solution was cooled
4. customevaporated in vacuo
5. customto yield an orange solid, which
6. customwas purified by column chromatography (DCM:MeOH—10:1)
7. customto yield a white solid
8. customThe solid was re-crystallized from DCM