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