4-Chlorobenzaldehyde → [Rac]-3-(4-{2-[2-(4-chloro-phenyl)-5-methyl-oxazol-4-yl]-ethoxy}-benzo[b]thiophen-7-yl)-2-ethoxy-propionic acid methyl ester

HRID 479161

Reaction equation

HRID 479161 reaction equation
[CH3:1][O:2][C:3](=[O:19])[CH:4]([O:16][CH2:17][CH3:18])[CH2:5][C:6]1[C:11]2[S:12][CH:13]=[CH:14][C:10]=2[C:9]([OH:15])=[CH:8][CH:7]=1.[Cl:20][C:21]1[CH:26]=[CH:25][C:24]([C:27]2[O:28][C:29]([CH3:35])=[C:30]([CH2:32][CH2:33]O)[N:31]=2)=[CH:23][CH:22]=1.ClC1C=CC(C=O)=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>>[CH3:1][O:2][C:3](=[O:19])[CH:4]([O:16][CH2:17][CH3:18])[CH2:5][C:6]1[C:11]2[S:12][CH:13]=[CH:14][C:10]=2[C:9]([O:15][CH2:33][CH2:32][C:30]2[N:31]=[C:27]([C:24]3[CH:25]=[CH:26][C:21]([Cl:20])=[CH:22][CH:23]=3)[O:28][C:29]=2[CH3:35])=[CH:8][CH:7]=1

Participants

6

Reactant 5

HCID 77264-ChlorobenzaldehydeHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 222739062-[2-(4-Chloro-phenyl)-5-methyl-oxazol-4-yl]-ethanol2×HCID 68616873[Rac]-2-ethoxy-3-(4-hydroxy-benzo[b]thiophen-7-yl)-propionic acid methyl ester

Product 1

HCID 69557111[Rac]-3-(4-{2-[2-(4-chloro-phenyl)-5-methyl-oxazol-4-yl]-ethoxy}-benzo[b]thiophen-7-yl)-2-ethoxy-propionic acid methyl ester

Procedure

In analogy to the procedure described in example 17 a], [rac]-2-ethoxy-3-(4-hydroxy-benzo[b]thiophen-7-yl)-propionic acid methyl ester was reacted with 2-[2-(4-chloro-phenyl)-5-methyl-oxazol-4-yl]-ethanol (prepared by conversion of the 4-chloro-benzaldehyde into 2-[2-(4-chloro-phenyl)-5-methyl-oxazol-4-yl]-ethanol in analogy to the sequence described in examples 21 a] to 21 e]) in the presence of triphenylphosphine and DEAD (diethyl azodicarboxylate) to yield [rac]-3-(4-{2-[2-(4-chloro-phenyl)-5-methyl-oxazol-4-yl]-ethoxy}-benzo[b]thiophen-7-yl)-2-ethoxy-propionic acid methyl ester, which was further saponified in analogy to the procedure described in example 91 e] to yield [rac]-3-(4-{2-[2-(4-chloro-phenyl)-5-methyl-oxazol-4-yl]-ethoxy}-benzo[b]thiophen-7-yl)-2-ethoxy-propionic acid as light yellow solid.

Sources & evidence

ORD record
ord-e57cd802f7664d9cbcf81720c0870cee
Source dataset
uspto-grants-2003_11
Patent number
US06642389B2

Linked notes

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