Tetrahedron p. 1880 - 1887 (2018)
Update date:2022-07-29
Topics:
Nagahora, Noriyoshi
Tokumaru, Hiroshi
Ikaga, Shinpei
Hanada, Takuya
Shioji, Kosei
Okuma, Kentaro
A series of new pyrylium salts that bear sulfonate and phosphonate groups were obtained from the reactions between 2,6-diphenyl-4H-pyran-4-one, sulfonic anhydride, and chlorophosphates, and analyzed spectroscopically. Furthermore, treatment of 2,6-diphenyl-4H-pyran-4-one with phosphoryl chloride or bromide afforded the corresponding 4-chloro- and 4-bromopyrylium tetrafluoroborates in good yield. Subsequently, the synthesis of the corresponding 4-chloro- and 4-bromophosphinines was accomplished by treating the respective chloro- and bromopyrylium tetrafluoroborates with tris(trimethylsilyl)phosphine.
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