作者:Russell L. Hillard、K.Peter C. Vollhardt
DOI:10.1016/0040-4020(80)80220-1
日期:1980.1
The CpCo(CO)2-catalyzed cyclization of 1-trimethylsilyl-1, 5-hexadiyne (4) with propargyltetrahy-dropyranylether (5 leads to the formation of both possible regioisomers of the benzocyclobutene product: 3-trimethylsilyl-4-tetrahydropyranyloxymethylbenzocyclobutene (6) and the corresponding 5-tetrahydropyranyloxymethyl-isomer 7. On the other hand, cyclization of the same diyne with 3-(trimethylsilyloxy)
CpCo(CO)2-炔丙基四氢-丁喃基醚(5)催化的1-trimethylsilyl-1,5-hexadiyne(4)环化(5导致苯并环丁烯产物的两种可能的区域异构体的形成:3-三甲基甲硅烷基-4- 4-hydrohydropyranyloxymethylbenzocyclobutene(6)和相应的5-四氢吡喃基氧基甲基-异构体7;另一方面,用3-(三甲基甲硅烷基氧基)丙炔(10)将相同的二炔环化,只得到3,4-二取代的产物,即游离醇11.化合物6被碘去甲硅烷基化,将醚水解,并将醇甲苯磺酸化,得到4-碘-5-甲苯磺酰氧基甲基苯并环丁烯13也可以通过ICI和甲苯磺酸化处理从11更直接获得。碘化物13可以与正丁基锂反应,得到各种掺入正丁基的产物,这些产物得自原料碳骨架的交叉偶联。标题化合物1可能是所观察产物的中间产物,但未被检测到。从适当的4,5-取代的苯并环丁烯到1的几种热消除路线均未成功