Triethylamine → N-(but-3-yn-1-yl)methanesulfonamide

To a 5-10° C. solution of tert-butyl but-3-yn-1-ylcarbamate (115 g, 0.675 mol) in dichloromethane (500 mL) was added 4N hydrochloric acid in dioxane (650 mL, 2.60 mol). After 3 hours at ambient temperature, the reaction mixture was concentrated in vacuo. The residue was washed with dichloromethane, then with diethyl ether, and then dried in vacuo to afford but-3-yn-1-amine hydrochloride as an intermediate. To a −5 to −10° C. solution of but-3-yn-1-amine hydrochloride and triethylamine (206 mL, 1.47 mol) in dichloromethane (500 mL) was added methanesulfonyl chloride (68.4 mL, 0.88 mol). After 3 hours at ambient temperature, the reaction mixture was diluted with 1N hydrochloric acid (150 mL). The organics were separated, washed with saturated aqueous sodium bicarbonate (150 mL) and with brine, then dried over magnesium sulfate, filtered, and concentrated in vacuo to afford N-but-3-yn-1-ylmethanesulfonamide.

1. customThe organics were separated
2. washwashed with saturated aqueous sodium bicarbonate (150 mL) and with brine
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo

ORD-Eintrag

ord-1c390108e9b34986ac797915efba6d6f

Quelldatensatz

uspto-grants-2013_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08455477B2