Benzyl Alcohol → HCID 86747858, compound

HRID 52249Notes

Reaction equation

HRID 52249 reaction equation
[N+]([C:4]1[CH:9]=[CH:8][C:7]([CH2:10][O:11][C:12](=[O:46])[C@@H:13]([CH3:45])[NH:14][C:15](=[O:44])[C@@H:16]([CH2:25][CH2:26][CH2:27][CH:28]([C:40]([O:42][CH3:43])=[O:41])[NH:29][C:30]([O:32][CH2:33][C:34]2[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=2)=[O:31])[NH:17][C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[CH:6][CH:5]=1)([O-])=O.C(O)[C:48]1[CH:53]=[CH:52][CH:51]=[CH:50][CH:49]=1>CC(C)[O-].[Ti+4].CC(C)[O-].CC(C)[O-].CC(C)[O-].C1COCC1>[C:7]1([CH2:10][O:11][C:12](=[O:46])[C@@H:13]([CH3:45])[NH:14][C:15](=[O:44])[C@@H:16]([CH2:25][CH2:26][CH2:27][CH:28]([C:40]([O:42][CH2:43][C:48]2[CH:53]=[CH:52][CH:51]=[CH:50][CH:49]=2)=[O:41])[NH:29][C:30]([O:32][CH2:33][C:34]2[CH:35]=[CH:36][CH:37]=[CH:38][CH:39]=2)=[O:31])[NH:17][C:18]([O:20][C:21]([CH3:23])([CH3:22])[CH3:24])=[O:19])[CH:6]=[CH:5][CH:4]=[CH:9][CH:8]=1

Participants

5

Reactant 2

HCID 244Benzyl AlcoholHCID 86747859N-[N2-[(1,1-dimethylethoxy)carbonyl]-N6-[(phenylmethoxy)-carbonyl]-(R)-6-[(methoxy)carbonyl]-L-lysyl]-D-alanine 4-nitrophenylmethyl ester

Product 1

HCID 86747858HCID 86747858, compoundYield 88.4%

Reagents, catalysts & solvents 2

HCID 11026Titanium isopropoxideCatalystHCID 8028TetrahydrofuranSolvent

Procedure

A mixture of N-[N2 -[(1,1-dimethylethoxy)carbonyl]-N6 -[(phenylmethoxy)-carbonyl]-(R)-6-[(methoxy)carbonyl]-L-lysyl]-D-alanine 4-nitrophenylmethyl ester (40a, Kolodziejczyk, et. al., Int. J. Pept. Prot. Res., 1992, 39, 382; 683 mg, 1.06 mmol), 4-- molecular sieves (2.15 g, crushed), THF (10.5 mL), and benzyl alcohol (11.0 mL, 105.6 mmol) is stirred for 30 min and then treated with titanium(IV) isopropoxide (82 μl, 0.27 meq). The resulting mixture is heated for 24 h at 85°-90° C. The solids are filtered through diatomaceous earth and the solvent removed. The excess benzyl alcohol is removed by distillation on a Kugelrohr apparatus (approx. 1000μ pressure, 50°-75° C.). The crude orange oil is chromatographed (2.5×31 cm column), gradient of 4:1-2:1 hexane/EtOAc) to provide 40b (633 mg, 88% yield): NMR δ1.39 (d, J=7.2, 3H), 1.43 (s, 9H), 1.40-1.67 (m, 4H), 1.84 (br s, 2H), 4.07 (br s, 1H), 4.40 (m, 1H), 4.58 (apparent quintet, 1H), 5.0 (br d, 1H), 5.07-5.25 (m, 6H), 5.43 (br d, J=7.9, 1H), 6.68 (br d, 1H), 7.33 (m); MS (HR-FAB) m/z 676.3232 (M+H, calcd. for C37H46N3O9, 676.3234).

Workup

  1. temperatureThe resulting mixture is heated for 24 h at 85°-90° C
  2. filtrationThe solids are filtered through diatomaceous earth
  3. customthe solvent removed
  4. customThe excess benzyl alcohol is removed by distillation on a Kugelrohr apparatus (approx. 1000μ pressure, 50°-75° C.)
  5. customThe crude orange oil is chromatographed (2.5×31 cm column), gradient of 4:1-2:1 hexane/EtOAc)

Sources & evidence

ORD record
ord-71fc0c56d6f749b1a05e40dde98b7bec
Source dataset
uspto-grants-1997_04
Patent number
US05616612

Reaction notes

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