Jacobi PA, Coutts LD, Guo J, Hauck SI, Leung SH. New strategies for the synthesis of biologically important tetrapyrroles. The "B,C + D + A" approach to linear tetrapyrroles.
J Org Chem 2000;
65:205-13. [PMID:
10813917 DOI:
10.1021/jo991503u]
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Abstract
Linear tetrapyrroles related to phytochrome (1) were prepared in enantiospecific fashion by a new strategy beginning with ring-B,C synthons of type 19 (bis-iododipyrrins). Rings A and D were elaborated by Pd(0)-mediated coupling of 19a with the appropriate alkyne acid or amide derivatives 9 and 20, followed by intramolecular cyclization (method C: BC + D + A --> ABCD).
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