In the present study, we were interested in pyrimidine systems 1 and 2 which we envisioned as precursors to interesting analogues of the commerical agricultural fungicide tricyclazole. Upon treatment with TFAA (DMF, room temp.), compound 1 produced the expected SES product 4 only as a minor product. The major product was the pyrrolinone 3. Similarly compound 2 produced a mixture of pyrrolinone 5 and SES cyclization products 6 and 7. The ditrifluoroacetylated product 7, undoubtedly arises from 6; such reactions of methyl pyrimidines are well known. [3]

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