Lawesson's reagent → (R)-tert-Butyl 2,2,4-trimethyl-4-(5-(4-(octyloxy)-3-(trifluoromethyl)phenyl)thiazol-2-yl)oxazolidine-3-carboxylate

HRID 2357061Notes

Reaction equation

[CH3:1][C:2]1([CH3:40])[N:6]([C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[C@@:5]([CH3:39])([C:14](=O)[NH:15][CH2:16][C:17]([C:19]2[CH:24]=[CH:23][C:22]([O:25][CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][CH2:31][CH2:32][CH3:33])=[C:21]([C:34]([F:37])([F:36])[F:35])[CH:20]=2)=O)[CH2:4][O:3]1.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:50])=CC=1>C1(C)C=CC=CC=1>[CH3:1][C:2]1([CH3:40])[N:6]([C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[C@@:5]([CH3:39])([C:14]2[S:50][C:17]([C:19]3[CH:24]=[CH:23][C:22]([O:25][CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][CH2:31][CH2:32][CH3:33])=[C:21]([C:34]([F:37])([F:36])[F:35])[CH:20]=3)=[CH:16][N:15]=2)[CH2:4][O:3]1

Participants

Conditions

Temperature: 100 °C

Procedure

A suspension of protected oxazolidine-amide 6 (180 mg, 1.0 equivalent) and Lawesson's Reagent (390 mg, 3.0 equivalents) in toluene (5 mL) was sealed and heated at 100° C. for 1 hour. After cooling to room temperature, the reaction mixture was purified by silica gel column chromatography using the Combi-Flash system (Hex:EtOAc) as a thick colourless oil in 67% yield (120 mg). TLC (1:2 EtOAc:Hex), Rf=0.8; MS (ESI, M+H+)=571.11; 1H NMR (400 MHz, CDCl3) δ 7.73 (br s, 1H), 7.70 (s, 1H), 7.61 (d, 1H, J=6.8 Hz), 7.01 (d, 1H, J=6.8 Hz), 3.96-4.28 (m, 4H), 1.21-1.99 (m, 30H), 0.89 (t, 3H, J=7.6 Hz).

Workup

customwas sealed
temperatureAfter cooling to room temperature
customthe reaction mixture was purified by silica gel column chromatography

Sources & evidence

ORD record: ord-e57b4c885fcb45c9a454ed8b99b6de68
Source dataset: uspto-grants-2010_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07759370B2

Reaction notes

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