Synthesis of novel cyclophanes containing both benzo[1,2-b:5,4-b′]difuran and naphthalene rings
作者:Kwanghee Koh Park、Hongsan Lim、Sun-Hyuk Kim、Dae Hyun Bae
DOI:10.1039/b110312a
日期:2002.1.23
Facile routes for the synthesis of novel cyclophanes 1a, b containing both benzo[1,2-b:5,4-bâ²]difuran and naphthalene rings have been developed. Irradiation of 1,5-dibenzoyl-2,4-dialkoxybenzene derivatives 3a, b with a 350 nm mercury lamp followed by dehydration afforded benzo[1,2-b:5,4-bâ²]difuran ring systems 5a, b. The cyclophanes 1a, b were prepared either from the ether-forming reaction between the preformed benzodifuran ring derivatives 5a, b and 2,7-dihydroxynaphthalene, or from the photocyclizationâdehydration
reaction of the macrocycles 6a, b prepared by reacting 1,5-dibenzoyl-2,4-bis(Ï-bromoalkoxy)benzene with 2,7-dihydroxynaphthalene. The cyclophanes 2a, b containing two benzo[1,2-b:5,4-bâ²]difuran and two naphthalene moieties were obtained as minor products.
已开发出合成新型含有苯并[1,2-b:5,4-b']二呋喃和萘环的环芳烃1a、b的简易途径。将1,5-二苯甲酰基-2,4-二烷氧基苯衍生物3a、b用350 nm汞灯照射后脱水,得到苯并[1,2-b:5,4-b']二呋喃环系统5a、b。制备环芳烃1a、b可以是从预形成的苯并二呋喃环衍生物5a、b与2,7-二羟基萘的醚形成反应,或者是通过由1,5-二苯甲酰基-2,4-双(Ï-溴烷氧基)苯与2,7-二羟基萘反应制备的宏环6a、b的光环化-脱水反应。含有两个苯并[1,2-b:5,4-b']二呋喃和两个萘部分的环芳烃2a、b是次要产物。