3-(2-Aminophenylthio)prop-1-yne 8 reacted with aryl iodides 9-18 under palladium-copper catalysis leading to the disubstituted alkynes 19-28 which after tosylation underwent a novel cyclization under copper catalysis to 2-substituted benzothiazolines 29-38. The expected 3-(arylidine)-2,3-dihydrobenzothiazines were not obtained.
[反应:参见文本] 3-(2-
氨基苯
硫基)丙-1-炔8在
钯-
铜催化下与芳基
碘化物9-18反应,生成二取代
炔烃19-28,在甲
苯磺酸作用下,该取代基在
铜催化下经历了新型环化反应2-取代的
苯并噻唑啉29-38。没有获得预期的3-(芳基)-2,3-二氢苯并
噻嗪。