Claims
- 1. A compound of the formula: ##STR11## X is hydrogen, chloro or bromo; M is keto or hydroxy or M and X together form a double bond; R.sub.1 and R.sub.2 are selected from the group consisting of hydrogen, nitro, cyano, trifluromethyl, halogen, alkyl (C.sub.1-4) acyl (C.sub.2-4), substituted acyl (C.sub.2-4), alkoxycarbonyl (C.sub.1-4), COOH, CONH.sub.2, CHO, benzoyl; and substituted benzoyl; and R.sub.7 and R.sub.8 are hydrogen or alkyl (C.sub.1-4) or when taken together form a ring (C.sub.5-8).
- 2. The compound of claim 1 wherein ##STR12##
- 3. The compound of claim 1 wherein ##STR13##
- 4. The compound of claim 1 wherein ##STR14##
- 5. A compound of claim 1 selected from the group consisting of:
- 5,6-dihydro-5,5-dimethyl-7H-thieno[3,2-b]pyran-7-one,
- 5,6-dihydro-7-hydroxy-5,5-dimethyl-7H-thieno[3,2-b]pyran,
- 5,5-dimethyl-5H-thieno[3,2-b]pyran,
- 3,4-dihydro-3,3-dimethyl-5H-thieno[2,3-b] pyran-5-one,
- 3,4-dihydro-5-hydroxy-3,3-dimethyl-5H-thieno[2,3-b]pyran,
- 3,3-dimethyl-3H-thieno[2,3-b]pyran,
- 4,5-dihydro-4,4-dimethyl-4H-thieno[3,4-b]pyran-6-one,
- 4,5-dihydro-6-hydroxy-4,4-dimethyl-6H-thieno[3,4-b]pyran, and
- 4,4-dimethyl-4H-thieno[3,4-b]pyran.
Parent Case Info
This is a division of application Ser. No. 249,043, filed Sept. 23, 1988, now U.S. Pat. No. 4,992,435.
Foreign Referenced Citations (2)
Number |
Date |
Country |
0120426 |
Oct 1984 |
EPX |
0139992 |
May 1985 |
EPX |
Non-Patent Literature Citations (1)
Entry |
Henrio, G. et al., Tetrahedron, vol. 33, pp. 191-198, (1977). |
Divisions (1)
|
Number |
Date |
Country |
Parent |
249043 |
Sep 1988 |
|