Trifluoroacetic acid → methyl cis-(3aRS,9bRS)-7-amino-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate

HRID 927911Notes

Reaction equation

HRID 927911 reaction equation
FC(F)(F)C(O)=O.C(OC([N:15](C(OC(C)(C)C)=O)[C:16]1[C:25]([C:26]([O:28][CH3:29])=[O:27])=[C:24]2[C:19]([C@H:20]3[CH2:32][CH2:31][O:30][C@H:21]3[CH2:22][O:23]2)=[CH:18][CH:17]=1)=O)(C)(C)C>C(Cl)Cl>[NH2:15][C:16]1[C:25]([C:26]([O:28][CH3:29])=[O:27])=[C:24]2[C:19]([C@H:20]3[CH2:32][CH2:31][O:30][C@H:21]3[CH2:22][O:23]2)=[CH:18][CH:17]=1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 86713278methyl cis-(3aRS,9bRS)-7-[bis-(tert-butoxycarbonyl)amino]-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate2×

Product 1

HCID 86713281methyl cis-(3aRS,9bRS)-7-amino-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylateYield 69.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Trifluoroacetic acid (7 mL) was added to a solution of methyl cis-(3aRS,9bRS)-7-[bis-(tert-butoxycarbonyl)amino]-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate (Intermediate 2, 0.66 g) in DCM (15 mL) and the mixture was stirred at room temperature for 1 hour. The mixture was evaporated to dryness and the residue was treated with aqueous sodium bicarbonate and extracted with DCM, dried (MgSO4) and filtered. The filtrate was evaporated to dryness to give methyl cis-(3aRS,9bRS)-7-amino-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate (0.255 g) as a gum.

Workup

  1. customThe mixture was evaporated to dryness
  2. additionthe residue was treated with aqueous sodium bicarbonate
  3. extractionextracted with DCM
  4. dry with materialdried (MgSO4)
  5. filtrationfiltered
  6. customThe filtrate was evaporated to dryness

Sources & evidence

ORD record
ord-d613f285db3f48fb8730553d3f1e1bb4
Source dataset
uspto-grants-2016_03
Patent number
US09290472B2

Reaction notes

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