Claims
- 1. A compound of the formula: ##STR16## wherein R.sup.1 is hydrogen, alkyl which is optionally substituted by halogen or hydroxy which may be substituted by a hydroxy-protecting group, or amino which is optionally substituted by an amino-protecting group;
- R.sup.2 is a carboxy-protecting group;
- R.sup.3 is aryl which is optionally substituted by halogen, lower alkyl, lower alkoxy, hydroxy, amino, or nitro;
- X is --SCH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, or C.sub.n H.sub.2n+1 CH.dbd.(n=0-5), each of which is optionally substituted by lower alkyl, lower alkoxy, lower alkylthio, aryl or lower alkenyl.
- 2. A compound according to claim 1 in which R.sup.3 is phenyl.
- 3. A compound according to claim 1 in which X is --SCH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 -- or CH.sub.3 CH.dbd..
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-022451 |
Feb 1993 |
JPX |
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Parent Case Info
This application is a division of now abandoned application Ser. No. 08/190,608, filed Feb. 2, 1994.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4122086 |
Hall |
Oct 1978 |
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Foreign Referenced Citations (1)
Number |
Date |
Country |
0528678 |
Feb 1993 |
EPX |
Non-Patent Literature Citations (3)
Entry |
Moriarty, Tet. Letters 34, 4129 (1993). |
Kalogiannis et al., The Journal of Organic Chemistry, vol. 55, No. 17 (1990) pp. 5041-5044. |
Fairfax et al., Journal of The Chemical Society, Perkin Transactions 1, No. 21 (1992) pp. 2837-2844. |
Divisions (1)
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Number |
Date |
Country |
Parent |
190608 |
Feb 1994 |
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