Cyclic compounds

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

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260396R, 549336, 549453, 549454, 560 53, 560 56, 562462, 562466, 568327, 568633, C07D33906, C07D31720, C07C 6995

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active

045187843

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 of 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:
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patent: 4116981 (1978-09-01), Kende
patent: 4196127 (1980-04-01), Johnson et al.
patent: 4316985 (1982-02-01), Broadhurst et al.
patent: 4393221 (1983-07-01), Broadhurst et al.
patent: 4409391 (1983-10-01), Broadhurst et al.
Lee, et al.; J. Org. Chem., 41(13), 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.
Smith, et al.; J. Org. Chem., 42, No. 23, (1977), pp. 3653-3660.
Swenton, et al., J.A.C.S., 100, No. 19, (1978), pp. 6188-6195.

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