A rapid and efficient one pot solvent/scavenger-free protocol for the synthesis of 2-iminothiazolidin-4-ones has been developed. Interestingly, the regio/stereoselective synthesis affords the regioisomeric (Z)-3-alkyl/aryl-2-(2-phenylcyclohex-2-enylimino)thiazolidin-4-one as the sole product in good yield. The selectivities observed have been rationalized based on the relative magnitude of the allylic strains developed during the course of the reaction. This is the first report wherein the impact of allylic strains in directing the regiocyclization has been noted.
已经开发了一种快速高效的单锅无溶剂/清除剂合成2-亚
氨基
噻唑啉-4-酮的方案。有趣的是,区域/立体选择性合成只产生区异构体(
Z)-3-烷基/芳基-2-(2-苯基环己-2-烯基亚
氨基)
噻唑啉-4-酮,收率良好。观察到的选择性是基于反应过程中产生的联烯应变相对大小的合理化。这是第一篇注意到联烯应变对定向区域环化的影响的报告。