Vanillin → 4-[((3S)-1-tert-butoxycarbonyl-3-pyrrolidinyl)oxy]-3-methoxybenzaldehyde

HRID 53992Notes

Reaction equation

HRID 53992 reaction equation
[O:1]=[CH:2][C:3]1[CH:11]=[CH:10][C:8]([OH:9])=[C:5]([O:6][CH3:7])[CH:4]=1.[C:12]([O:16][C:17]([N:19]1[CH2:23][CH2:22][C@@H:21](O)[CH2:20]1)=[O:18])([CH3:15])([CH3:14])[CH3:13].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1>[C:12]([O:16][C:17]([N:19]1[CH2:23][CH2:22][C@H:21]([O:9][C:8]2[CH:10]=[CH:11][C:3]([CH:2]=[O:1])=[CH:4][C:5]=2[O:6][CH3:7])[CH2:20]1)=[O:18])([CH3:15])([CH3:13])[CH3:14]

Participants

6

Reactant 4

HCID 1183VanillinHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 6544479tert-Butyl (3R)-3-hydroxypyrrolidine-1-carboxylate

Product 1

HCID 572736224-[((3S)-1-tert-butoxycarbonyl-3-pyrrolidinyl)oxy]-3-methoxybenzaldehydeYield 77.9%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

In 50 ml of tetrahydrofuran were dissolved 3.04 g of vanillin, 3.74 g of (3R)-1-tert-butoxycarbonyl-3-hydroxypyrrolidine and 5.24 g of triphenylphosphine. The thus prepared solution was mixed with 4.00 g of diethyl azodicarboxylate, and the mixture was stirred at room temperature for 18 hours. After concentrating the resulting reaction solution, the thus obtained residue was purified by subjecting it to silica gel column chromatography using an ethanol/chloroform mixture as an elution solvent. In this way, 5.0 g of the title compound was obtained in an oily form.

Workup

  1. concentrationAfter concentrating
  2. customthe resulting reaction solution
  3. customthe thus obtained residue was purified

Sources & evidence

ORD record
ord-bfb02eb9f09543ed9df7d38c1dc494f7
Source dataset
uspto-grants-1997_04
Patent number
US05620991

Reaction notes

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