| 摘要 |
The invention comprises: (a) 21-hydroxyalkyl 5-nitro -2- furfurylidenecarbazates; (b) 21-haloalkyl 5-nitro -2- furfurylidenecarbazates; (c) the preparation of compounds (a) by reacting an alkylene carbonate with hydrazine to produce a 2-hydroxyalkyl carbazate and reacting this with a compound having a reactive divalent 5-nitro-2-furfurylidene radical (e.g. 5-nitrofurfural or its diacetate); (d) the preparation of compounds (b) by treating compounds (a) with a halogenating agent (e.g. thionyl chloride); and (e) the preparation of an N-(51-nitro -21- furfurylidene) -3-amino -2- oxazolidone by carrying out processes (c) and (d) and treating the product of (d) with an alkali metal alkanolate, hydroxide or carbonate. Compounds (a) and (b), besides being intermediates in process (e), are useful as coccidiostats. |
