Hydrochloric Acid → (3R,5S)-1-allyloxycarbonyl-3-hydroxy-5-[1-hydroxy-1-(imidazo[5,1-b]thiazol-3-yl)methyl]pyrrolidine

HRID 568265Notes

Reaction equation

HRID 568265 reaction equation
Cl.[CH2:2]([O:5][C:6]([N:8]1[C@H:12]([CH:13]([OH:22])[C:14]2[N:15]3[CH:21]=[N:20][CH:19]=[C:16]3[S:17][CH:18]=2)[CH2:11][C@@H:10]([O:23][Si](C(C)(C)C)(C)C)[CH2:9]1)=[O:7])[CH:3]=[CH2:4].C(=O)([O-])O.[Na+]>C(#N)C.C(OCC)(=O)C>[CH2:2]([O:5][C:6]([N:8]1[C@H:12]([CH:13]([OH:22])[C:14]2[N:15]3[CH:21]=[N:20][CH:19]=[C:16]3[S:17][CH:18]=2)[CH2:11][C@@H:10]([OH:23])[CH2:9]1)=[O:7])[CH:3]=[CH2:4]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 516892Sodium BicarbonateHCID 20639577HCID 20639577, compound

Product 1

HCID 70220671(3R,5S)-1-allyloxycarbonyl-3-hydroxy-5-[1-hydroxy-1-(imidazo[5,1-b]thiazol-3-yl)methyl]pyrrolidineYield 113.9%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

Concentrated hydrochloric acid (0.34 ml) is added dropwise to a solution of 372 mg of (3R,5S)-1-allyloxycarbonyl-3-t-butyldimethylsilyloxy-5-[1-hydroxy-1-(imidazo[5,1-b]thiazol-3-yl)methyl]pyrrolidine (stereoisomer B), described in Synthesis Example 4-a), in 8.5 ml of dry acetonitrile under ice cooling (internal temperature 3° C.). The mixture is stirred in this state for 20 min and diluted with 50 ml of ethyl acetate, and the diluted solution is adjusted to pH 9.2 by addition of a 5% aqueous sodium hydrogencarbonate solution, followed by shaking. The organic layer is separated. The aqueous layer is extracted twice with 50 ml of ethyl acetate while adjusting the pH value to 9.2 by addition of a 5% aqueous sodium hydrogencarbonate solution. The organic layer is combined with the above organic layer, and the combined organic layers are dried over magnesium sulfate, followed by filtration and the removal of the solvent by evaporation under reduced pressure to give 313 mg of crude (3R,5S)-1-allyloxycarbonyl-3-hydroxy-5-[1-hydroxy-1-(imidazo[5,1-b]thiazol-3-yl)methyl]pyrrolidine (stereoisomer B) as a slight yellow viscous material.

Workup

  1. stirringby shaking
  2. customThe organic layer is separated
  3. extractionThe aqueous layer is extracted twice with 50 ml of ethyl acetate
  4. additionby addition of a 5% aqueous sodium hydrogencarbonate solution
  5. dry with materialthe combined organic layers are dried over magnesium sulfate
  6. filtrationfollowed by filtration
  7. customthe removal of the solvent
  8. customby evaporation under reduced pressure

Sources & evidence

ORD record
ord-fd9afb23ef1e49e7a3a407b1f047bc06
Source dataset
uspto-grants-2001_01
Patent number
US06180622B2

Reaction notes

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