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2005
Pyrrole derivatives
R 0120
Synthesis of Alkyl-Substituted Dipyrrolylmethylenes. — Condensation of pyrroles
one unsubstituted position [cf. (VII)] with pyrrolecarbaldehydes or their oxa08- 111 bearing
or thia-analogues (X) provides a wide variety of dipyrrolylmethylene derivatives (XI)
in good yield. Alternatively, symmetrical dipyrrolylmethylenes [cf. (V)] are achieved
by direct reaction of pyrrolecarboxylates like (III) with formic acid. Synthesis of the
starting compounds is described. — (SEMEIKIN, A. S.; SYRBU, S. A.; BEREZIN, M.
B.; LYUBIMOVA, T. V.; Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol. 47 (2004)
4, 10-14; Ivanovskii gos. khim.-tekhnol. univ., Ivanova, Russia; Russ., Abstr. Eng.)
— Mischke
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