This invention relates generally to a novel process for preparing 5-deazariboflavins by the cyclization of the corresponding 6-(N-substituted arylamino)uracils with trialkylorthoformate in the presence of a strong acid catalyst. An improved process for preparing the uracil intermediate is also disclosed. More particularly, it is concerned with the process for preparing 5-deazariboflavin by cyclizing 6-[3,4-dimethyl-N-(D-ribityl)anilino[uracil with trialkylorthoformate in the presence of a strong acid catalyst and hydrolyzing the resulting alkoxymethylene derivative. The corresponding uracil intermediate is prepared by reacting 6-chlorouracil with N-D-ribityl-3,4-xylidine. 5-Deazariboflavins having the general Formula (I) herein below: ##STR1## wherein R.sub.7 is hydrogen or methyl, R.sub.8 is methyl, hydroxy or acyloxy and R.sub.10 is a ribityl group and the corresponding acyl and alkoxymethylene derivatives are useful as riboflavin antagonists with particular utility for the chemotherapy of coccidiosis in chickens or as intermediates for the preparation of said antagonists. The bis(alkoxymethylene) derivatives described herein are useful as prodrug forms of 5-deazariboflavins. When used for the treatment of coccidiosis, such compounds are administered to the animals by way of the feed and are effective in preventing coccidiosis when administered at levels of from about 0.0005% to about 0.05% by weight of the total feed consumed, the amount required for optimum prevention or control of the disease varying with the particular compound employed.
本发明涉及一种新颖的制备5-去
氨基
黄酮的方法,该方法通过将相应的6-(N-取代芳基
氨基)尿
嘧啶与三烷基正酸甲酯在强酸催化剂存在下环化而得。本发明还揭示了一种改进的制备尿
嘧啶中间体的方法。更具体地说,本发明涉及通过将6-[3,4-二甲基-N-(
D-核糖基)
苯胺基]尿
嘧啶与三烷基正酸甲酯在强酸催化剂存在下环化并
水解所得的烷氧基
甲烷衍
生物来制备5-去
氨基
黄酮。相应的尿
嘧啶中间体是通过将6-
氯尿
嘧啶与N-
D-核糖基-
3,4-二甲基苯胺反应制备的。具有下面一般式(I)的5-去
氨基
黄酮:其中R.sub.7为氢或甲基,R.sub.8为甲基、羟基或酰氧基,R.sub.10为
核糖基,相应的酰基和烷氧基
甲烷衍
生物可作为
核黄素拮抗剂,特别适用于鸡球虫病的化疗,或作为制备该拮抗剂的中间体。本文中描述的双(烷氧基
甲烷)衍
生物可作为5-去
氨基
黄酮的前药形式。当用于治疗球虫病时,这些化合物通过饲料方式给动物口服,当以总饲料重量的0.0005%至0.05%的
水平给予时,能够有效地预防球虫病,所需的最佳预防或控制疾病的化合物数量因所使用的特定化合物而异。