Benzopyran intermediates

Details Benzopyran intermediates Benzopyran intermediates

1991-08-22

1993-05-11

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549401, 549404, C07D31122, C07D31104

Patent

active

052102343

ABSTRACT:
A compound of the following formula: ##STR1## wherein: R.sub.1 and R.sub.2 is hydrogen or C.sub.1-4 alkyl or R.sub.1 and R.sub.2 together are C.sub.2-5 polymethylene; R.sub.3 is hydroxy, C.sub.1-6 alkoxy or C.sub.1-7 alkylcarbonyloxy; R'.sub.4 is ethyl, isopropyl, t-butyl or cyclopentyl, and R.sup.1.sub.6 is hydrogen or C.sub.1-6 alkyl.

REFERENCES:
patent: 4062870 (1977-12-01), Watts
patent: 4203895 (1980-05-01), Parcell
patent: 4813598 (1989-05-01), Van Lommen
Naidu et al. "Covenient synthesis of . . . " CA 90:167385z (1979).
Naidu et al. "A new facile synthesis . . . " CA91:175134c (1979).
Lap et al. "4-Aminochroman-3-ols . . . " CA 91:39260p (1979).

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