Chelation-control in the formal [3+3] cyclization of 1,3-bis-(silyloxy)-1,3-butadienes with 1-hydroxy-5-silyloxy-hex-4-en-3-ones. One-pot synthesis of 3-aryl-3,4-dihydroisocoumarins
作者:Ihsan Ullah、Muhammad Sher、Rasheed Ahmad Khera、Asad Ali、Muhammad Farooq Ibad、Alexander Villinger、Christine Fischer、Peter Langer
DOI:10.1016/j.tet.2010.01.019
日期:2010.3
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。