HAp(hydroxyapatite)-encapsulated-γ-Fe2O3 supported sulfonic acid nanoparticles were used for the preparation of two series of 2-thioxopyrido[2,3-d]pyrimidines. In the first series, 2-thioxopyrido[2,3-d]pyrimidines were synthesised from 3-(6-amino-1,2,3,4-tetrahydro-4-oxo-2-thioxopyrimidin-5-yl)-3-oxopropanenitrile and arylaldehydes in the presence of [γ-Fe2O3@HAp-SO3H] as a nanocatalyst, in high yields (84–96%). In the second series, [γ-Fe2O3@HAp-SO3H] was used to catalyse the reaction of 6-amino-2-(alkylthio)-pyrimidine-4,6(1H,5H)-dione, 1,3-diethyl-2-thioxodihydropyrimidine-4,6(1H,5H)-dione and various arylaldehydes to prepare 2-thioxo-2,3,7,10-tetrahydropyrido[2,3-d:5,6-d']dipyrimidine-4,6 (1H,5H)-diones in excellent yields (93–98%).
利用 HAp(羟基磷灰石)-封装-γ-Fe2O3 支持的磺酸纳米粒子制备了两个系列的 2-硫酮并吡啶并[2,3-d]嘧啶。在第一个系列中,以 3-(6-氨基-1,2,3,4-四氢-4-氧代-2-硫酮嘧啶-5-基)-3-氧代丙腈和芳基醛为原料,在[γ-Fe2O3@HAp-SO3H]纳米催化剂存在下合成了 2-硫酮嘧啶并[2,3-d]嘧啶,产率高达 84-96%。在第二个系列中,[γ-Fe2O3@HAp-SO3H] 被用来催化 6-氨基-2-(烷硫基)-嘧啶-4,6(1H,5H)-二酮、1,3-二乙基-2-硫酮二氢嘧啶-4,6(1H,5H)-二酮和各种芳基醛的反应,制备 2-硫酮-2,3,7,10-四氢吡啶并[2,3-d:5,6-d']二嘧啶-4,6(1H,5H)-二酮,收率极高(93-98%)。