Synthesis of achiral and homochiral dibenzo[b.f]phosphepin 5-oxides using bromine/lithium exchange. X-ray structure of (10R, 11R)-10,11-dihydroxy-10,11-dihydro-5-phenyl-5H-dibenzo[b.f]phosphepin 5-oxide
An improved synthesis of 5-phenyldibenzo[b.f]phosphepin5-oxide by a seven step one-pot procedure and the synthesis of enantiomerically pure 5-phenyl- and 5-propyldibenzo[b.f]phosphepin5-oxides by use of McMurry coupling, Sharpless dihydroxylation and a bromine-lithium exchange strategy is described.