Triethylamine → (1R,3S)-3-[(tert-butoxycarbonyl)amino]cyclopentyl methanesulfonate

Temperatur

4 °C

Methanesulphonyl chloride (0.98 ml, 12.6 mmol) was added to a stirred mixture of (1S-cis)-(3-hydroxycyclopentyl)carbamic acid 1,1-dimethylethyl ester (1.41 g, 7.01 mmol) and triethylamine (1.76 ml, 12.6 mmol) in acetone(55 ml) at 4° C. The resulting mixture, containing a white precipitate, was stirred at 4° C. for one hour, then at 21° C. for a further 2.25 h, after which it was diluted with water(150 ml) and extracted with ethyl acetate (3×100 ml). The total organic solution was washed with water (50 ml), dried (MgSO4) and evaporated to a white solid. This was dissolved in hot diethyl ether (25 ml) and cooled to 4° C. for 2 h, after which time, cyclohexane (25 ml) was added which caused a precipitate to form immediately. The mixture was left to stand at 4° C. for a further 3 h, after which the solid was filtered off, washed with cold cyclohexane/diethyl ether(2:1), then dried to give the title compound (1.202 g) as a white solid, m.p. 88°-89° C., [α]D -11.11° (CHCl3 c=0.54%).

1. additionThe resulting mixture, containing a white precipitate
2. waitat 21° C. for a further 2.25 h
3. extractionextracted with ethyl acetate (3×100 ml)
4. washThe total organic solution was washed with water (50 ml)
5. dry with materialdried (MgSO4)
6. customevaporated to a white solid
7. dissolutionThis was dissolved in hot diethyl ether (25 ml)
8. temperaturecooled to 4° C. for 2 h
9. additionafter which time, cyclohexane (25 ml) was added which
10. customto form immediately
11. waitThe mixture was left
12. waitto stand at 4° C. for a further 3 h
13. filtrationafter which the solid was filtered off
14. washwashed with cold cyclohexane/diethyl ether(2:1)
15. customdried

ORD-Eintrag

ord-bdbf29c2adab4862a1916403930c884b

Quelldatensatz

uspto-grants-1999_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05889178