Process to produce hexahydronaphthacene derivatives

Details Process to produce hexahydronaphthacene derivatives Process to produce hexahydronaphthacene derivatives

1981-11-04

1983-07-12

Brust, Joseph Paul

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

260351, 2603511, 2603515, 549336, 549338, C07C 5022, C07D31772, C07D33906

Patent

active

043932215

ABSTRACT:
There is presented a process for the manufacture of hexahydronaphthacene derivatives of the general formula ##STR1## wherein one of R.sup.1 and R.sup.2 represents a hydrogen atom and the other represents a hydrogen atom or a hydroxy group or R.sup.1 and R.sup.2 together represent a protected oxo group, R.sup.3 represents a hydrogen atom or a hydroxy or acyloxy group and R.sup.4 represents a lower alkyl or esterified carboxy group or a group of the formula ##STR2## wherein R.sup.5 and R.sup.6 together form an oxo group or a protected oxo group and X represents a hydrogen atom or a hydroxy or acyloxy group
or ##STR3## in which n stands for 1 or 2 and Y represents a hydrogen atom or an alkyl or acyl group.
Also presented are certain of the novel derivatives per se and various novel intermediates in the process.

REFERENCES:
patent: 4116981 (1978-09-01), Kende
patent: 4196127 (1980-04-01), Johnson et al.
patent: 4316985 (1982-02-01), Broadhurst et al.
Lee et al., J. Org. Chem., 41 (3), 1976, pp. 2296-2303.
Farina et al.; Tetrahedron Letters, No. 17, 1972, pp. 1655-1658.
Kende et al.; Tetrahedron Letters, No. 40, 1977, pp. 3537-3540.

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