Synthesis of [1,2,4]Oxadiazolo[4,5-a]thiazolo[2,3-b]pyrimidin-9(10H)-ones via 1,3-Dipolar Cycloaddition of Nitrile Oxide to Thiazolo[3,2-a]pyrimidin-3-one Derivatives
作者:Xiaofang Li、Aiting Zheng、Bin Liu、Xianyong Yu、Pinggui Yi
DOI:10.1002/cjoc.201090181
日期:——
A new class of [1,2,4]oxadiazolo[4,5‐a]thiazolo[2,3‐b]pyrimidin‐9(10H)‐one was prepared in moderate yields by the reaction of nitrile oxide with 2‐arylmethylidene‐6,7‐dihydro‐5H‐thiazolo[3,2‐a]pyrimidin‐3‐one. The reaction site of dipolarphile is the CN of thiazolo[3,2‐a]pyrimidin‐3‐one rather than the expected CC of arylmethylidene. The structures of the products were characterized thoroughly by
通过一氧化二氮与2-的反应制备了中等收率的新型[1,2,4]恶二唑并[4,5- a ]噻唑并[2,3 - b ]嘧啶9(10 H)-一亚苄基-6,7-二氢-5- ħ -噻唑并[3,2-一个]嘧啶-3-酮。偶极亲核试剂的反应位点是噻唑[3,2 - a ]嘧啶-3-酮的CN,而不是芳基亚甲基的预期CC。通过IR,元素分析,MS和NMR分析对产物的结构进行了彻底的表征。