A novel
Mn(II)-promoted tandem phosphorylation/cyclization reaction
of 2-biaryl isothiocyanates with phosphine oxides is described. This
is the first general method to synthesize 6-phosporylated phenanthridines
from 2-biaryl isothiocyanates. The approach is featured by oxidant-free,
low loading of P-reagent, easy operation, and high functional group
tolerance
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