The reaction of 4‐amino‐5,5‐dimethyl‐5H‐1,2‐oxathiole 2,2‐dioxide (1) with 2‐(arylidene)malononitriles 2 in ethanol, at reflux, using piperidine as catalyst, afforded 5‐amino‐3,3‐dimethyl‐7‐aryl‐3H‐[1,2]oxathiolo[4,3‐b]pyridine‐6‐carbonitrile 1,1‐dioxides (3) in moderate chemical yields.
使用哌啶作催化剂,在乙醇中使4-氨基-5,5-二甲基-5 H 1,2-恶唑2,2-二氧化物(1)与2-(亚芳基)丙二腈2在乙醇中的反应,得到5 -氨基-3,3-二甲基-7-芳基-3 H- [1,2]氧杂硫代[4,3 - b ]吡啶-6-腈1,1-二氧化物(3)的化学收率中等。
Synthesis of 4-Amino-5<i>H</i>-1,2-oxathiole 2,2-Dioxides by Cyclization of Cyanohydrin Mesylates. New Routes to β-Amino and β-Keto Sulfonic Acids