in toluene
Ar atmosphere, stirring (60°C, 3 h); solvent removal (14 Torr), B-product isolated by sublimation (30-40°C, 0.001 Torr); byproducts identified by MS and (31)P-NMR;
Kaminski, James J.; Hilbert, James M.; Pramanik, B. N.; Solomon, Daniel M.; Conn, David J.; et al.
Journal of Medicinal Chemistry, 1987 , vol. 30, # 11 p. 2031 - 2046