Method of preparing furocoumarins

Details Method of preparing furocoumarins Method of preparing furocoumarins

1977-11-14

1979-10-02

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26034344, C07D49304

Patent

active

041698401

ABSTRACT:
This invention relates to an improved method of preparing furocoumarins having the following formula: ##STR1## wherein R is a radical selected from the group consisting of hydrogen, hydroxy and lower alkoxy, which comprises reacting a coumarin having the following formula: ##STR2## or the alkali metal salt thereof, with a haloacetal having the following formula: ##STR3## WHEREIN R.sub.1 is a lower alkyl group and Hal is selected from the group consisting of chlorine and bromine; and to the intermediate products thereof, namely a substituted coumarin acetal of the following formula: ##STR4## and the corresponding coumarin aldehyde of the following formula: ##STR5##

REFERENCES:
patent: 2889337 (1959-06-01), Stanley et al.
patent: 3201421 (1965-08-01), Kaufman
patent: 3862134 (1975-01-01), Scherrer
Bradsher, Chemical Reviews, vol. 38, 1946.

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