Synthesis of New Thiazolo[3,2-a]pyrimidin-5-one Derivatives in Reaction of 3-Allyl-2-thiouracils Cyclization
摘要:
The series of thiazolo[3,2-a]pyrimidin-5-one derivatives in cyclization reaction of 3-allyl-2-thiouracil derivatives with iodine monochloride, and then hydrogen iodide elimination from intermediate reaction product has been obtained. On the basis of the studies of reaction kinetics, the elimination reaction mechanism has been proposed. Moreover, the influence of substituent on the reaction elimination rate has been investigated.
2-iodomethyl-2,3-dihydrothiazolo[3,2-a]pyrimidin-5-ones are prepared via the reaction of 3-allyl-2-thiouracil derivatives with bromine or iodine chloride, respectively. The 6-bromo and 6-nitro derivatives are synthesized by an electrophilic substitution at C-6 of the thiazolopyrimidine system. As a result, novel 2,3-dihydrothiazolo[3,2-a]pyrimidin-5-one derivatives are obtained. Hydrogen halide elimination
通过3-烯丙基-2-硫尿嘧啶衍生物分别与溴或氯化碘反应,制得2-溴甲基-和2-碘甲基-2,3-二氢噻唑并[3,2- a ]嘧啶-5-酮。通过噻唑并嘧啶系统的C-6处的亲电取代合成6-溴和6-硝基衍生物。结果,获得了新的2,3-二氢噻唑并[3,2 - a ]嘧啶-5-酮衍生物。还报道了从2-卤甲基-2,3-二氢噻唑并[3,2 - a ]嘧啶-5-酮中消除卤化氢。