Trifluoromethanesulfonic anhydride → 6-[1-Hydroxy-2-methyl-1-(1-trityl-1H-imidazol-4-yl)propyl]-2-naphthyl Trifluoromethanesulfonate

HRID 480445Notes

Reaction equation

[F:1][C:2]([F:15])([F:14])[S:3]([O:6]S(C(F)(F)F)(=O)=O)(=[O:5])=[O:4].[OH:16][C:17]([C:45]1[CH:46]=[C:47]2[C:52](=[CH:53][CH:54]=1)[CH:51]=[C:50](O)[CH:49]=[CH:48]2)([C:21]1[N:22]=[CH:23][N:24]([C:26]([C:39]2[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=2)([C:33]2[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=2)[C:27]2[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=2)[CH:25]=1)[CH:18]([CH3:20])[CH3:19]>N1C=CC=CC=1.O>[F:1][C:2]([F:15])([F:14])[S:3]([O:6][C:50]1[CH:49]=[CH:48][C:47]2[C:52](=[CH:53][CH:54]=[C:45]([C:17]([OH:16])([C:21]3[N:22]=[CH:23][N:24]([C:26]([C:39]4[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=4)([C:33]4[CH:34]=[CH:35][CH:36]=[CH:37][CH:38]=4)[C:27]4[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=4)[CH:25]=3)[CH:18]([CH3:19])[CH3:20])[CH:46]=2)[CH:51]=1)(=[O:5])=[O:4]

Participants

Conditions

Temperature: 0 °C

Procedure

Trifluoromethanesulfonic anhydride (9.1 mL) was added dropwise to a solution of 6-(1-hydroxy-2-methyl-1-(1-trityl-1H-imidazol-4-yl)propyl)-2-naphthol (27.0 g) in pyridine (200 mL) at 0° C. The reaction mixture was stirred for 1 h at 0° C., diluted with water and extracted with ethyl acetate. The organic layer was washed with brine, dried and concentrated. The residue was purified by silica gel column chromatography (eluent; hexane-ethyl acetate=1:1). Crystallization from diisopropyl ether gave the titled compound (29.6 g) as a colorless powder.

Workup

extractionextracted with ethyl acetate
washThe organic layer was washed with brine
customdried
concentrationconcentrated
customThe residue was purified by silica gel column chromatography (eluent; hexane-ethyl acetate=1:1)
customCrystallization from diisopropyl ether

Sources & evidence

ORD record: ord-572bb105840e4666833adeae9b41221f
Source dataset: uspto-grants-2003_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06649643B1

Reaction notes

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