反应详情

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##