A reaction sequence involving halogenation and replacement of the halo substituent by a nitro group using dinitrogen tetraoxide has led to a general, convenient route to 5-nitrooxazoles. Reaction schemes employing both bromine and iodine as the halo substituent have been investigated; however, the method using iodine preceded by a mercuration step affords a better overall yield in the range of 20–50%
                                    涉及卤化和使用
四氧化二氮用硝基取代卤素取代基的反应序列已导致制备5-硝基
恶唑的一般方便途径。已经研究了同时使用
溴和
碘作为卤素取代基的反应方案。但是,在
碘化步骤之后使用
汞的方法,总产率在20%至50%范围内更好。虽然后者的总收率较低(4–12%),但可以通过后一序列制备2-和4-硝基-
恶唑。