Claims
- 1. A compound having the structure: ##STR24## wherein R.sup.1 is a removable N-protecting group selected from phenylalkyl having 7-12 carbon atoms, 2,4-dimethoxybenzyl, alkyl having 1-6 carbon atoms and .alpha.-methylbenzyl and R is a removable carboxy protecting group selected from alkyl having 1-6 carbon atoms, phenyl and phenylalkyl having 7-12 carbon atoms.
- 2. The compound of claim 1 wherein R.sup.1 is selected from 2,4-dimethoxyphenyl, .alpha.-methylbenzyl, and benzyl and R is selected from ethyl, benzyl, phenyl, methyl and t-butyl.
- 3. The compound of claim 1 wherein R is ethyl and R.sup.1 is benzyl.
- 4. A compound having the structure: ##STR25## wherein R is H or a removable carboxy protecting group selected from alkyl having 1-6 carbon atoms, phenyl and phenylalkyl having 7-12 carbon atoms.
- 5. The compound of claim 4 wherein R is selected from ethyl, benzyl, phenyl, methyl and t-butyl.
- 6. The compound of claim 4 wherein R is benzyl.
Parent Case Info
This is a division of application Ser. No. 255,193, filed Apr. 17, 1981, now U.S. Pat. No. 4,344,885, which is a continuation of U.S. Ser. No. 112,058 filed Jan. 14, 1980, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4282148 |
Liu et al. |
Aug 1981 |
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4287123 |
Liu et al. |
Sep 1981 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
255193 |
Apr 1981 |
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Continuations (1)
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Number |
Date |
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Parent |
112058 |
Jan 1980 |
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