Process for dienoic condensation known as the diels-alder reacti

Details Process for dienoic condensation known as the diels-alder reacti Process for dienoic condensation known as the diels-alder reacti

1997-12-29

1999-04-06

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568377, C07C 49623

Patent

active

058921249

ABSTRACT:
Improved process for implementing the Diels-Alder reaction that consists in using reagents in the presence of at least one liquid salt of general formula Q.sup.+ A.sup.-, in which Q.sup.+ represents a quaternary ammonium and/or phosphonium and A.sup.- represents an anion and optionally at least one Lewis acid. The anion is preferably selected from the group that is formed by tetrafluoroborate, hexafluorophosphate, hexafluoroantimonate, hexafluoroarsenate, perfluoroalkylsulfonate, fluorosulfonate or else dichlorocuprate, tetrachloroborate, tetrachloroaluminate, and trichlorozincate. At the end of the reaction, the organic phase is separated, and the polar phase is reused.

REFERENCES:
Kagan & Riant, "Catalytic Asymmetric Diels-Alder Reactions", Chem. Rev., 92:1007-1019, 1992.
Otto et al., "Lewis Acid Catalysis of a Diels-Alder Reaction in Water", J. Am. Chem. Soc., 118:7702-7702, 1996.

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