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ChemInform Abstract Hydrolysis of the diesters (VI) (9 examples; obtained from the bromides (I)) and subsequent decarboxylation provide the desired cyclazines (VII). Similarly, the benzocyclazines (X) are synthesized starting from the known salt (VIII).

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A new synthesis of imidazo[1,2‐a]pyridine and imidazo[2,1‐a]isoquinoline derivatives 4 and 8, respectively by 1,5‐dipolar cyclization reactions of stabilized pyridinium N‐ylides 3a‐e or isoquinolinium N‐ylide 7 is described. The starting N‐ylides 3a‐e and 7 are prepared by the reaction of the corresponding pyridinium salts 1a‐e or isoquinolinium salts 6 with N‐bis(methylthio)methylene‐p‐toluenesulfonamide (2).

230ChemInform Abstract Starting with the cyanobenzoindolizine (I), the title compound (IIIc) is prepared by cycloaddition and cleavage. (UV-, 1H-NMR-data).