Reaction of functionalized organolithium compounds with substituted oxiranes: useful methodology for 1,6- and 1,7-diols, and tetrahydrobenzoxepines
作者:Miguel Yus、Tatiana Soler、Francisco Foubelo
DOI:10.1016/s0040-4020(02)00696-8
日期:2002.8
The reaction of dianions 2, derived from the reductive opening of phthalan (1a) or isochroman (1b) with lithium and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB) at 0°C, with several epoxides 3 at the same temperature gave, after hydrolysis, 1,6- and 1,7-diols, respectively. Dehydration of 1,6-diols by treatment with BF3·OEt2 in dichloromethane at temperatures ranging from −30 to 20°C gave
二价阴离子的反应2,从phthalan(的还原开口衍生1A)或异苯并二氢吡喃(1B与锂和)催化量的4,4'-二-叔-butylbiphenyl(DTBB)在0℃下,与几个环氧化物3在相同温度下,水解后分别得到1,6-和1,7-二醇。通过在-30至20℃的温度下用BF 3 ·OEt 2在二氯甲烷中处理来将1,6-二醇脱水,从而以非常好的收率得到四氢苯并x庚因5。在相同的反应条件下,1,7-二醇4没有进行脱水。