Novel benzopyran derivatives

Details Novel benzopyran derivatives Novel benzopyran derivatives

1976-03-05

1978-08-22

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D31104

Patent

active

041088719

ABSTRACT:
Novel benzopyran derivatives of the formula ##STR1## 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.dbd.CH--; X is a free, esterified or etherified hydroxy group; and Y is H or X and Y collectively are .dbd.O; and W is --(CH.sub.2).sub.3 --Z--R.sub.4, ##STR2## --(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 or a free, esterified or etherified hydroxymethylene 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: 3758509 (1973-09-01), Rosenberger et al.
patent: 3813417 (1974-05-01), Cohen et al.
patent: 3849447 (1974-11-01), Eder et al.
Fedorova et al., Chemical Abstract, 73, 15073g (1970).

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