Takahashi T, Ogasawara S, Echizen S, Shinozaki Y, Tamiaki H. C3
1-Selective substitution of cationic N-heteroaromatic groups into a 3-vinylated chlorophyll-a derivative.
Org Biomol Chem 2019;
17:5490-5495. [PMID:
30869105 DOI:
10.1039/c9ob00130a]
[Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A variety of N-containing heteroarenes were site-selectively introduced at the C31-position of a chlorophyll-a derivative possessing a 3-vinyl group through a C-N+ bond via oxidative reactions using iodine in the presence of a silver(i) salt. Electron-rich N-heteroarenes were effectively substituted, while electron-withdrawing or bulky nitrogen-neighboring substituents suppressed the reactivities. The cationic products formed were characterized by 1D/2D NMR, and their optical properties were also investigated.
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