Methanol → (2s,4r)-4-(n-Tert-butoxycarbonylglycylamino)-2-hydroxymethyl-n-tert-butoxycarbonylpyrrolidine

HRID 2185488Notes

Reaction equation

HRID 2185488 reaction equation
CO.[C:3]([O:7][C:8]([NH:10][CH2:11][C:12]([NH:14][C@H:15]1[CH2:19][N:18]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[C@H:17]([C:27](O)=[O:28])[CH2:16]1)=[O:13])=[O:9])([CH3:6])([CH3:5])[CH3:4].[BH4-].[Li+].O>O1CCCC1>[C:3]([O:7][C:8]([NH:10][CH2:11][C:12]([NH:14][C@H:15]1[CH2:19][N:18]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[C@H:17]([CH2:27][OH:28])[CH2:16]1)=[O:13])=[O:9])([CH3:4])([CH3:6])[CH3:5]

Participants

6

Reactant 4

HCID 887MethanolHCID 962WaterHCID 4148881Lithium borohydrideHCID 21341559trans-4-(N-tert-butoxycarbonylglycyl)amino-N-tert-butoxycarbonyl-L-proline

Product 1

HCID 70172939(2s,4r)-4-(n-Tert-butoxycarbonylglycylamino)-2-hydroxymethyl-n-tert-butoxycarbonylpyrrolidineYield 97.8%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Methanol (8 mL) was added over a period of 1 hr to a refluxed mixture of trans-4-N-tert-butoxycarbonylglycylamino)-N-tert-butoxycarbonyl-L-proline methyl ester (Compound D103 (B), 1.39 g) and lithium borohydride (328 mg) in tetrahydrofuran (30 mL). After being cooled, water was added to the mixture and the product was extracted twice with chloroform. The combined organic layers were dried over anhydrous sodium sulfate, then evaporated in vacuo and the residue was purified by silica gel column chromatography (chloroform:methanol=95:5, v/v) to give title compound (1.31 g): 1H NMR (400 MHz, CDCl3) δ 1.46 (s, 9H), 1.47 (s, 9H), 1.89 (m, 1H), 1.98 (m, 1H), 3.34 (dd, J=11.7, 3.9 Hz, 1H), 3.60 (d, J=5.9 Hz, 1H), 3.64 (d, J=5.9 Hz, 1H), 3.69 (m, 1H), 3.75 (d, J=5.9 Hz, 1H), 4.04 (m, 1H), 4.42 (m, 1H), 4.55 (m, 1H), 5.15 (m, 1H), and 6.44 (m, 1H).

Workup

  1. temperatureAfter being cooled
  2. extractionthe product was extracted twice with chloroform
  3. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
  4. customevaporated in vacuo
  5. customthe residue was purified by silica gel column chromatography (chloroform

Sources & evidence

ORD record
ord-8081b9b314fd4fe58dfad07b0b181a98
Source dataset
uspto-grants-2002_06
Patent number
US06399629B1

Reaction notes

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