A simple synthetic route to [f]-annulated theophyllines ([f]-annulated 3,7-dihydro-1,3-dimethyl-1H-purine-2,6-diones) is described, based on intramolecular nucleophilic addition, and starting from ethyl (E)-4-[(8-substituted) theophyllin-7-yl]-2-butenoates. The presence of an 8-hydroxymethyl group enables the formation of hexahydro-9H-[1,4]oxazino[3,4-f]purine derivatives 3a, in the case of an 8-methylthio substituent, 8, the products are hexahydro- 9H-[1,4]thiazino[3,4-f]purine 9, and similarly with 8-hydrazino derivatives 12, octahydro[1,2,4]triazino[3,4-f]purines 14 are obtained.
描述了 [f]-环状茶碱([f]-环状 3,7-二氢-1,3-二甲基-1H-
嘌呤-2,6-二酮)的简单合成路线,基于分子内亲核加成,并起始由(E)-4-[(8-取代)茶碱-7-基]-
2-丁烯酸乙酯得到。 8-羟甲基的存在能够形成六氢-9H-[1,4]恶嗪基[3,4-f]
嘌呤衍
生物3a,在8-甲
硫基取代基8的情况下,产物是六氢-得到9H-[1,4]
噻嗪基[3,4-f]
嘌呤9,与8-
肼基衍
生物12类似,得到八氢
[1,2,4]三嗪[3,4-f]
嘌呤14。