Process for the catalytic preparation of 3-isochromanones from p

Details Process for the catalytic preparation of 3-isochromanones from p Process for the catalytic preparation of 3-isochromanones from p

1999-01-27

1999-12-14

Trinh, Ba K.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549283, 549288, 549289, C07D31110, C07D31114, C07D31116

Patent

active

060020202

ABSTRACT:
Good yields and selectivities are achieved in a process for preparing an isochroman-3-one of the formula (I) ##STR1## by reacting a 1,3-dihydroisobenzofuran of the formula (II) ##STR2## with carbon monoxide at a CO pressure of from 0.1 to 20 MPa in the presence of an ionic halide, a palladium catalyst and a dipolar aprotic solvent.

REFERENCES:
patent: 5663370 (1997-09-01), Bowden et al.
XP-002103592 "Reductive Electrophillic Substitution of Phthalans and Ring Expansion to Isochroman Derivatives,"U. Azzena, S. Demartis, M. Fiori, G. Melloni and L. Pisano, Tetrahedron Letters, vol. 36, No. 44, pp. 8123-8126, 1995.
XP-002103591 "1,2-Di (lithiomethyl) benzene From Phthalan: Sequential Introduction of Two Different Electrophiles,"J. Almena, F. Foubelo and M. Yus, Tetrahedron, vol. 51, No. 11, pp. 3351-3364, 1995.

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