The simplest synthesis of 5,5-disubstituted and spiranic methyl 4-amino-2,2-dioxo-2,5-dihydro-1,2λ6-oxathiole-3-carboxylates
作者:Alexey V. Dobrydnev、Bohdan V. Vashchenko、Yulian M. Volovenko
DOI:10.1016/j.tetlet.2018.03.029
日期:2018.4
We report the short and the simplest strategy for the synthesis of methyl 4-amino-2,2-dioxo-2,5-dihydro-1,2λ6-oxathiole-3-carboxylates bearing aliphatic substituents at the 5th position. A number of cyanohydrins were forced to react with methyl 2-(chlorosulfonyl)acetate to give the interim methyl 2-[(cyanomethoxy)sulfonyl]acetates that upon Et3N-mediated conditions underwent the CSIC [Carbanion mediated
我们报告的短且简单的策略用于合成4-氨基-2,2-二氧代-2,5-二氢- 1,2λ 6 -oxathiole -3-羧酸盐在第5位置轴承脂族取代基。迫使许多氰醇与2-(氯磺酰基)乙酸甲酯反应,得到中间的2-[(氰基甲氧基)磺酰基]乙酸甲酯,该酯在Et 3 N-介导的条件下经历了CSIC [碳离子介导的磺酸酯(磺酰胺基)分子内环化]反应得到5,5-二取代的和spiranic 4-氨基-2,2-二氧代-2,5-二氢- 1,2λ 6 -oxathiole -3-羧酸盐。