20-Methylisobacteriochlorins, important in relation to biosynthetic studies on vitamin B12, and their 20-cyano analogues, have been synthesised by a mild route compatible with the side-chains of natural isobacteriochlorins; this involves assembly of the A–D ring system using a Witting-type reaction and finally photochemical ring-closure to the macrocycle.
D. M. Arnott, A. R. Battersby, P. J. Harrison, G. B. Henderson and Z. Sheng, J. Chem. Soc., Chem. Commun., 1984, 525 DOI: 10.1039/C39840000525
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