Process for preparing benzopyran derivatives

Details Process for preparing benzopyran derivatives Process for preparing benzopyran derivatives

1973-06-06

1976-06-08

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603452, 260464, 260488B, 260586F, C07D31178

Patent

active

039622800

ABSTRACT:
Novel benzopyran derivatives of the formula ##SPC1##
Wherein R.sub.1 and R.sub.3 each are lower alkyl; n is the integer 1 or 2; --A--B-- is >CH--CH.sub.2 -- or >CH=CH--; X is a free, esterified or etherified hydroxy group; and Y is H or X and Y collectively are =O; and W is --(CH.sub.2).sub.3 --Z--R.sub.4,
--(ch.sub.2).sub.3 --coor.sub.6 or --(CH.sub.2).sub.3 CN, wherein V is halogen, Z is a ketalized carbonyl group R.sub.4 and R.sub.5 each are lower alkyl and R.sub.6 is alkyl, aryl or aralkyl, are valuable intermediates in the synthesis of steroids.

REFERENCES:
patent: 2846446 (1958-08-01), Knowles
patent: 3644407 (1972-02-01), Rosenberger
patent: 3708500 (1973-01-01), Rosenberger
patent: 3825569 (1974-07-01), Hajos
patent: 3849447 (1974-11-01), Eder et al.
Fedoroua et al., J. Gen. Chem., USSR, 40, pp. 660-662, (1970).

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