Claims
- 1. The process of preparing a compound of the formula ##EQU2## by reacting a 3-hydroxy-3-methylcepham compound of the formula ##EQU3## and at least 1 molar equivalent of a halogenating agent selected from the group consisting of CO(X).sub.2, SO(X).sub.2, and P(X).sub.5 in the presence of at least 1 molar equivalent (with respect to the halogenating agent) of a tertiary carboxamide selected from the group consisting of ##EQU4## at a temperature between about 50.degree. and 120.degree.C., wherein in the above formulae, R is C.sub.2 -C.sub.8 alkanoyl, benzoyl or a group represented by the formula
- P -- (O).sub.n -- (CH.sub.2).sub.m C(O)-- --
- wherein P is 2-thienyl, 3-thienyl, 2furyl, phenyl or phenyl substituted by C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, nitro, fluoro, chloro, bromo, iodo, cyano, or trifluoromethyl; n is 0 or 1, and m is 0, 1, 2, or 3; with the limitation that when n is 1, m is not 0, and P is phenyl or phenyl substituted by C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, nitro, fluoro, chloro, bromo, iodo, cyano, or trifluoromethyl;
- R.sub.1 is a conventional carboxylic acid protecting group; R.sub.2 is hydrogen or C.sub.1 -C.sub.6 alkyl, and each of R.sub.3 and R.sub.4 is independently C.sub.1 -C.sub.6 alkyl, phenyl, tolyl or xylyl such that R.sub.3 and R.sub.4 together contain no more than 11 carbon atoms; R.sub.5 is C.sub.1 -C.sub.6 alkyl, phenyl, tolyl, or xylyl; j is an integer from 3 to 6 inclusive; k is an integer from 3 to 6 inclusive; and X is chlorine or bromine.
- 2. The process of claim 1 wherein R.sub.1 is 2,2,2-trihaloethyl, benzyhydryl, C.sub.4 -C.sub.6 tertiary alkyl, benzyl, methoxybenzyl, nitrobenzyl, C.sub.2 -C.sub.6 alkanoyloxymethyl, phenacyl, succinimidoethyl, and phthalimidomethyl.
- 3. The process of claim 2 wherein m is 1 and P is phenyl or phenyl substituted by C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy nitro, fluoro, chloro, bromo, iodo, cyano, or trifluoromethyl.
- 4. The process of claim 3 wherein X is chlorine.
- 5. The process of claim 4 wherein the tertiary carboxamide is N,N-dimethylformamide, N,N-dimethylacetamide, or N-methyl-2-pyrrolidinone.
- 6. The process of claim 5 wherein the halogenating agent is thionyl chloride or phosphorous pentachloride.
- 7. The process of claim 6 wherein R.sub.1 is benzyl, p-nitrobenzyl, p-methoxybenzyl, benzhydryl, or trichloroethyl.
- 8. The process of claim 7 wherein the 3-hydroxy-3-methylcepham compound is reacted with 1.1-2.0 equivalents of thionyl chloride and the tertiary carboxamide, present in an amount at least equivalent to the amount of thionyl chloride employed therein, at 50.degree. to 90.degree.C. in an aprotic solvent.
- 9. The process of claim 8 wherein P is phenyl and m is 1.
- 10. The process of claim 9 wherein the aprotic solvent is benzene or toluene.
- 11. The process of claim 10 wherein the 3-hydroxy-3-methylcepham compound is p-nitrobenzyl 7-phenoxyacetamido-3-hydroxy-3-methylcepham-4-carboxylate.
- 12. The process of claim 5 wherein the 3-hydroxy-3-methylcepham compound is reacted with 1.1 to 2.0 equivalents of the halogenating agent in a tertiary carboxamide solvent at a temperature of about 60.degree. to 90.degree.C.
- 13. The process of claim 12 wherein P is phenyl and m is 1.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of our copending U.S. application Ser. No. 465,778, filed May 1, 1974 now abandoned.
Non-Patent Literature Citations (1)
Entry |
kukolja et al, J.A.C.S., vol. 94, pp. 7169-7170, (1972). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
465778 |
May 1974 |
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