作者:Makoto Yamamoto、Makoto Suzuki、Keiki Kishikawa、Shigeo Kohmoto
DOI:10.1055/s-1993-25854
日期:——
Lewis acid mediated cyclization of 2,3-epoxypropylbenzoylcarbamates is described. trans-Aryl-substituted epoxy carbamates cyclized to 4-(α-benzoylbenzyl)-1,3-dioxolan-2-ones and 4-aryl-3-benzoyl-5-hydroxymethyloxazolidin-2-ones. On the contrary, cis-aryl- and alkyl-substituted epoxy carbamates gave only 4-[1-(benz-oyloxy)alkyl]oxazolidin-2-ones. Mechanism of this cyclization is also discussed.
描述了路易斯酸介导的2,3-环氧丙基苯甲酰氨基甲酸酯的环化反应。反式芳基取代的环氧氨基甲酸酯环化为4-(α-苯甲酰苄基)-1,3-二氧戊环-2-酮和4-芳基-3-苯甲酰基-5-羟甲基恶唑烷-2-酮。相反,顺式芳基和烷基取代的环氧氨基甲酸酯仅生成4-[1-(苯甲酰氧基)烷基]恶唑烷-2-酮。还讨论了这种环化的机理。