Diisobutylaluminumhydride → (R)-1-(N-Benzyloxycarbonylpyrrolidin-2-yl)-3-hydroxypropene

HRID 2188259Notes

Reaction equation

[CH2:1]([O:8][C:9]([N:11]1[CH2:15][CH2:14][CH2:13][C@@H:12]1[CH:16]=[CH:17][C:18](OCC)=[O:19])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].C([Al+]CC(C)C)C(C)C>C(=O)([O-])O.[Na+]>[CH2:1]([O:8][C:9]([N:11]1[CH2:15][CH2:14][CH2:13][C@@H:12]1[CH:16]=[CH:17][CH2:18][OH:19])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: -78 °C

Procedure

To a stirred solution of ethyl (R)-3-(N-benzyloxycarbonylpyrrolidin-2-yl)-2-propenoate (3.03 g, 10.00 mmol) in anhydrous tetreahydrofuran (75 mL) at −78° C. under nitrogen was added dropwise a solution of diisobutylaluminum hydride (1.0 M in hexanes, 22.0 mL, 22.0 mmol, 2.2 eq). The resulting solution was stirred at −78° C. under nitrogen for 30 minutes. The reaction solution was then allowed to warm to room temperature over the course of 2 hours. A saturated solution of sodium hydrogen carbonate (50 mL) was added, and the aqueous mixture was extracted with ethyl acetate (3×50 mL). The extracts were combined, dried (MgSO4), and evaporated under reduced pressure. Column chromatography of the residue with diethyl ether/hexanes [1:1] afforded the title compound as a clear colorless oil (1.41 g, 5.40 mmol, 54%): 1H NMR (CDCl3)δ7.40-7.25 (m, 5H), 5.75-5.53 (m, 2H), 5.20-5.00 (m, 2H), 4.38 (br m, 1H), 4.06 (br d, J=13.7 Hz, 2 H), 3.45 (br t, J=7.0 Hz, 1 H), 2.03-1.68 (m, 4 H); [α]25=+34° (MeOH, c=1.0); HRMS calculated for C15H19NO3 261.1365, found 261.1356.

Workup

temperatureto warm to room temperature over the course of 2 hours
extractionthe aqueous mixture was extracted with ethyl acetate (3×50 mL)
dry with materialdried (MgSO4)
customevaporated under reduced pressure

Sources & evidence

ORD record: ord-7b5136eb917f432eac6924eeb232f800
Source dataset: uspto-grants-2002_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06410739B1

Reaction notes

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