its cyclization directed to the formation of N-confused chlorins. To achieve the site-directed selectivity of the cyclization, the 2-position of rac-2 was activated by an electron-withdrawing cyano function and its 1-position was blocked by a methyl group. In spite of this provision, the cyclization occurred at the apparently blocked 1-position with loss or migration of the methyl substituent.
Synthesis of a chlorin with annelated lactam ring as subunit for artificial photosynthetic reaction centres
作者:Franz-Peter Montforts、Elmar Haake
DOI:10.24820/ark.5550190.p010.463
日期:——
A chlorin with an annelated cyclic ketone moiety was synthesized from a tricyclic nickel complex and appropriate pyrrole building blocks. Ketone functionality of the target chlorin allows Beckmann rearrangement to yield chlorinlactams. Lactam moieties on the chlorin represent masked amino acid structures which should allow formation of peptide-like backbones, along which chlorin pigments are arranged