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200517.fm Page 126 Friday, March 18, 2005 2:52 PM
2005
Pyrrole derivatives
R 0120
9-Acylation of 1-Acyldipyrromethanes Containing a Dialkylboron Mask for the
Motif. — An efficient method for the 9-acylation of 1-acyldipyr17- 115 α-Acylpyrrole
romethanes is developed. Masking of the α-acylpyrrole unit by introduction of dialkylboron strongly improves the yield. The resulting boron complexes can smoothly be
decomplexed under neutral conditions or can be used directly in porphyrin synthesis.
Additionally, it is shown that the boron-masked acyldipyrromethanes also undergo
effective 9-bromination. — (ZAIDI, S. H. H.; MUTHUKUMARAN, K.; TAMARU,
S.-I.; LINDSEY*, J. S.; J. Org. Chem. 69 (2004) 24, 8356-8365; Dep. Chem., N. C.
State Univ., Raleigh, NC 27695, USA; Eng.) — Jannicke
200517.fm Page 127 Friday, March 18, 2005 2:52 PM
2005
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