The [3+3] cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 1-hydroxy-5-silyloxy-hex-4-en-3-ones resulted in the one-pot formation of 3-aryl-3,4-dihydroisocoumarins. The reactions proceeded by regioselective cyclization to give 6-(2-aryl-2-chloroethyl)salicylates, which underwent a silica gel-mediated lactonization. The cyclizations of protected 1-amino-5-silyloxy-hex-4-en-3-ones proved to be not
1,3-双(甲
硅烷氧基)-
1,3-丁二烯与1-羟基-5-甲
硅烷氧基-hex-4-en-3-one的[3 + 3]环化导致一锅形成3-芳基-3,4-二
氢异
香豆素。反应通过区域选择性环化进行,得到6-(2-芳基-2-
氯乙基)
水杨酸酯,将其进行
硅胶介导的内
酯化。被保护的1-
氨基-5-甲
硅烷氧基-hex-4-en-3-ones的环化被证明不是区域选择性的。