N-methylhydroxylamine hydrochloride → 1-(2-thienyl)-2-(1H-imidazol-1-yl)-N-methylethanimine N-oxide
Reaction equation
[S:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[C:6](=O)[CH2:7][N:8]1[CH:12]=[CH:11][N:10]=[CH:9]1.Cl.[CH3:15][NH:16][OH:17]>>[S:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[C:6](=[N+:16]([O-:17])[CH3:15])[CH2:7][N:8]1[CH:12]=[CH:11][N:10]=[CH:9]1Participants
Procedure
As illustrated in the following diagram, the thienyl compounds of this invention can be prepared by an initial bromination of 2-acetylthiophene 1, and reacting the resulting bromo derivative 2 with imidazole to produce the 1-(2-thienyl)-2-(1H-imidazol-1-yl)ethanone 3. Reaction of compound 3 with N-methylhyroxylamine hydrochloride provides the 1-(2-thienyl)-2-(1H-imidazol-1-yl)-N-methylethanimine N-oxide 4 which is included in the subject matter of our co-pending application Ser. No. 900,856 filed Aug. 27, 1986 entitled "α-Substituted Ketonitrone Derivatives" whose disclosure is incorporated herein by reference. The nitrone compound 4 is then treated with styrene or an appropriate styrene (or allyl phenyl ether or alkyl phenyl thioether) derivative 5 to give a diastereomeric mixture of the desired cis- and trans-5-(phenyl, phenoxymethyl or phenylthiomethyl)-3-(2-thienyl)-3-(1H-imidazol-1-ylmethyl)-2-methylisoxazolidine 6. ##STR3##
Sources & evidence
- ORD record
- ord-42408f46a88a41d8a16a7af940093507
- Source dataset
- uspto-grants-1988_09
- Patent number
- US04769470
Reaction notes
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