Potassium Carbonate → [Rac]-3-{4-[2-(4-tert-butyl-phenyl)-5-methyl-oxazol-4-ylmethoxy]-2-isopropoxy-phenyl}-2-ethoxy-propionic acid ethyl ester

HRID 1394808Notes

Reaction equation

HRID 1394808 reaction equation
[CH2:1]([O:3][C:4](=[O:21])[CH:5]([O:18][CH2:19][CH3:20])[CH2:6][C:7]1[CH:12]=[CH:11][C:10]([OH:13])=[CH:9][C:8]=1[O:14][CH:15]([CH3:17])[CH3:16])[CH3:2].[C:22]([C:26]1[CH:31]=[CH:30][C:29]([C:32]2[O:33][C:34]([CH3:39])=[C:35]([CH2:37]Cl)[N:36]=2)=[CH:28][CH:27]=1)([CH3:25])([CH3:24])[CH3:23].C(C1C=CC(C=O)=CC=1)(C)(C)C.O=P(Cl)(Cl)Cl.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[CH2:1]([O:3][C:4](=[O:21])[CH:5]([O:18][CH2:19][CH3:20])[CH2:6][C:7]1[CH:12]=[CH:11][C:10]([O:13][CH2:37][C:35]2[N:36]=[C:32]([C:29]3[CH:28]=[CH:27][C:26]([C:22]([CH3:25])([CH3:24])[CH3:23])=[CH:31][CH:30]=3)[O:33][C:34]=2[CH3:39])=[CH:9][C:8]=1[O:14][CH:15]([CH3:16])[CH3:17])[CH3:2]

Participants

7

Reactant 5

HCID 11430Potassium CarbonateHCID 24813Phosphorus oxychlorideHCID 703244-tert-ButylbenzaldehydeHCID 121582182-(4-Tert-butyl-phenyl)-4-chloromethyl-5-methyl-oxazoleHCID 69280498[Rac]-2-ethoxy-3-(4-hydroxy-2-isopropoxy-phenyl)-propionic acid ethyl ester

Product 1

HCID 69283426[Rac]-3-{4-[2-(4-tert-butyl-phenyl)-5-methyl-oxazol-4-ylmethoxy]-2-isopropoxy-phenyl}-2-ethoxy-propionic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

In analogy to the procedure described in example 1 f], [rac]-2-ethoxy-3-(4-hydroxy-2-isopropoxy-phenyl)-propionic acid ethyl ester was reacted with 2-(4-tert-butyl-phenyl)-4-chloromethyl-5-methyl-oxazole (prepared from 4-tert-butyl-benzaldehyde and diacetyl monoxyme followed by treatment with POCl3 in analogy to the procedures described in examples 5 a] and 2 b]) in N,N-dimethylformamide in the presence of potassium carbonate to yield [rac]-3-{4-[2-(4-tert-butyl-phenyl)-5-methyl-oxazol-4-ylmethoxy]-2-isopropoxy-phenyl}-2-ethoxy-propionic acid ethyl ester, which was further saponified in analogy to the procedure described in example 1 g], to yield [rac]-3-{4-[2-(4-tert-butyl-phenyl)-5-methyl-oxazol-4-ylmethoxy]-2-isopropoxy-phenyl}-2-ethoxy-propionic acid as colorless viscous oil, which can be separated into its antipodes by methods known in the art, such as separation of the antipodes via diastereomeric salts by crystallization with optically pure amines such as e.g. (R) or (S)-1-phenyl-ethylamine, (R) or (S)-1-naphthalen-1-yl-ethylamine, brucine, quinine and quinidine or by separation of the antipodes by specific chromatographic methods using either a chiral adsorbens or a chiral eluent to give the title compound.

Sources & evidence

ORD record
ord-df09132e331c4c299440edf41112e9be
Source dataset
uspto-grants-2008_03
Patent number
US07348349B2

Reaction notes

Loading…