ChemInform Abstract: NEW CARBON‐PHOSPHORUS HETEROCYCLE ‐ 5,11‐DIHYDRO‐6,11‐DIOXO‐11‐PHENYLDIBENZO(BE)AZA‐5,11‐PHOSPHEPINE

Divergent synthesis of benzoxaphospholenes and phosphacoumarins via the reaction of 2-alkenylphenols with phosphorus(iii/v) chlorides

“…6 Therefore, great attention has been paid to the development of new synthetic approaches for P-C-heterocycles. 7 Previously, Petrov 8 reported on the acid-catalyzed cyclization of alkoxyvinylphosphonates, which leads to the formation of phosphacoumarins (benzo[e]-1,2-oxaphosphinines) (Scheme 1a). The reaction of P,P,P-trihalodioxabenzophospholes with terminal alkyl-and aryl-acetylenes was found to yield the benzo[e]-1,2-oxaphosphinines bearing an alkyl or aryl substituent in the β-position to the phosphorus atom (Scheme 1b).…”