base-promoted C(sp3)–H bond functionalization strategy for the synthesis of multisubstituted chromans from the formal [3+3] cycloaddition of benzo[c]oxepines and electron-rich phenols has been developed. The corresponding 4H-chromenes can be easily obtained in excellent yields by simple filtration from chromans. Preliminary mechanistic studies indicate that the C–O bondcleavage is the key step for the
已经开发了一种有效的碱促进的C(sp 3)–H键官能化策略,用于从苯并[ c ]氧杂环丁烷和富电子的酚的正式[3 + 3]环加成反应合成多取代的苯并二氢吡喃。通过从色烷简单过滤,可以容易地以优异的产率容易地获得相应的4 H-色烯。初步的机理研究表明,C-O键断裂是C(sp 3)-H键功能化的关键步骤,该反应可能是通过串联C-O键断裂/ Michael加成/环化反应而发生的。
Generation of o-quinodimethanes (o-QDMs) from benzo[c]oxepines and the synthetic application for polysubstituted tetrahydronaphthalenes
A novel method for the generation of o-quinodimethane (o-QDM) intermediates is reported using a mild and efficient base-promoted ring-opening of benzo[c]oxepines. Among the benzo[c]oxepines studied, indanone containing analogues demonstrated the greatest variety of reactivity. A number of decay modes were observed, in addition with trapping of the o-QDM intermediates using dienophiles for the synthesis
报道了一种使用温和有效的碱促苯并[ c ]氧杂环丁烷的开环方法来生成邻喹啉甲烷(o- QDM)中间体的新方法。在所研究的苯并[ c ]氧杂环丁烷中,含茚满酮的类似物表现出最大的反应活性。除了使用二烯亲和剂捕获邻-QDM中间体以合成具有高区域选择性的多取代四氢萘外,还观察到许多衰变模式。这项研究提供了一种从苯并[ c ] oxepine前体生成o -QDM中间体的新方法。