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The reaction of 1-methyl-2-nitromethylenepyrrolidine with arylisothiocyanates in the presence of a base was found to proceed at the 3-СН 2 group of the nitroenamine followed by further cyclization to afford 4-R-imino-1-methyl-1,2,3,4-tetrahydro-6H-thieno[3,4-b]pyrrol-6-one oximes. Under analogous conditions, alkylisothiocyanates add to 1-methyl-2-nitromethylenepyrrolidine giving 1-methyl-2-nitromethylenepyrrolidine-3-carbothioic...
A facile procedure for the synthesis of benzannelated diazacycloalkanes 3 is elaborated on the basis of reductive cleavage of 1,2-polymethylenebenzimidazoles 2 with DIBAL-H. The reduction of the corresponding salts prepared by treatment of 1,2-polymethylenebenzimidazoles 2 with methyl iodide proceeded differently affording exclusively o-phenylenediamines 10. The limitations and scope of the method...
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