Synthesis of Locked meso-β-Substituted Chlorins via 1,3-Dipolar Cycloaddition
作者:Michał Gałȩzowski、Daniel T. Gryko
DOI:10.1021/jo060545x
日期:2006.8.1
A novel approachtoward “locked” chlorins with increased stability has been studied in detail. The chlorin skeleton is assembled in a convergent fashion from two fragments via a porphyrin forming reaction, followed by 1,3-dipolar cycloaddition of azomethine ylides, which are formed in situ. Central to the success of the process is the presence of two electron-withdrawing groups in vicinal positions
The reductive coupling of 2-cyanopyrroles: A study pertaining to the mechanism of formation of porphocyanines
作者:Christian Brückner、Lily Y. Xie、David Dolphin
DOI:10.1016/s0040-4020(97)10424-0
日期:1998.3
ethyl)imine when treated with lithium aluminum hydride (LAH), followed by a mild work-up. A plausible mechanism of this reductive coupling was inferred from a series of experiments, including 27Al-NMR, deuteration experiments, and the reduction of variously substituted cyanopyrroles. The mechanism, a metal chelate mediated dimerization, may be the key to understanding porphocyanine synthesis via the