This work highlights the use of 3‐vinyl‐1,2,4‐triazines as original thia‐Michael acceptors and inverse electron demanding Diels‐Alder platforms en route to new 7,8‐dihydro‐5H‐thiopyrano[4,3‐b]pyridines. The required but rather unstable propargylthiol nucleophiles were successfully generated in‐situ upon an innovative DBU‐catalyzed methanolysis event of the corresponding propargyl thioacetate derivatives.

中文翻译：

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有机催化的Thia-Michael加成反应和对3-乙烯基1,2,4-三嗪平台的顺序逆电子要求Diels-Alder反应

这项工作着重说明了将3-乙烯基1,2,4-三嗪用作原始的thia-Michael受体和要求逆电子的Diels-Alder平台在通往新的7,8-dihydro-5 H -thiopyrano的途中[4,3- b ]吡啶。在创新的DBU催化相应的炔丙基硫代乙酸酯衍生物的甲醇分解事件后，成功地原位生成了所需的但不稳定的炔丙基硫醇亲核试剂。