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2004
Fused pyrrole derivatives
R 0160
Synthesis of Pyrroles from 1-Dialkylamino-3-phosphoryl(or phosphanyl)allenes
1,5-Cyclization of Conjugated Azomethine Ylide Intermediates. — It is
47- 112 Through
found for the first time, that 1-amino-1,3-diarylallenes are able to undergo cyclization
to pyrrole derivatives. The presence of a phosphanyl or phosphoryl group at C-3 is
essential to shift the reaction course from a known 1,7-cyclization mode toward a
1,5-cyclization mode. Based on this method, a convenient one-pot synthesis of pyrrole
derivatives is developed starting from enaminoketones. — (REISSER, M.; MAAS*,
G.; J. Org. Chem. 69 (2004) 15, 4913-4924; Abt. Org. Chem., Univ. Ulm,
D-89081 Ulm, Germany; Eng.) — Jannicke
2004
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