Carbon Dioxide → Pent-4-yn-1-yl methanesulfonate

To pentyne-4-ol (Farchan Chemical Co) (42.0 g: 0.5 mols) in 500 mL ether at -5° C. (dry ice bath) is added in a rapid dropwise fashion triethylamine (104.8 mL; 0.75 mols) diluted with 100 mL ether. While maintaining the temperature at or below 15° C. throughout, methane sulfonyl chloride, (94.2 mL; 0.70 mols) diluted with 100 mL ether, is added dropwise over 45 minutes. The thick suspension is stirred an additional 30 minutes, after which the precipitate is filtered. The filter cake is washed with ether and the combined ether layers washed twice with water, then once with brine. The ether layer is then dried over anhydrous magnesium sulfate and solvent removed under reduced pressure to yield the product as a pale yellow oil; yield 64 g (79%), which is used in the next step without further purification.

1. additionis added dropwise over 45 minutes
2. filtrationafter which the precipitate is filtered
3. washThe filter cake is washed with ether
4. washthe combined ether layers washed twice with water
5. dry with materialThe ether layer is then dried over anhydrous magnesium sulfate and solvent
6. customremoved under reduced pressure

ORD-Eintrag

ord-efb019971ae34fc9be9e5f4cbc2bbaaa

Quelldatensatz

uspto-grants-1996_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05563113