Relevance of oxyanion stereochemistry to chirality transfer in anionic oxy-Cope rearrangements
作者:Leo A. Paquette、George D. Maynard
DOI:10.1021/ja00039a011
日期:1992.6
undergo anionic oxy-Cope rearrangement under the exclusice control of oxyanion orientation with a 58-64% preference for equatorial oxygen. Six semicyclic dienols have also been synthesized where the preferred oxyanion-driven sigmatropic rearrangement pathway is obligatorily pitted against π-facial biases offered by 4-tert-butylcyclohexenyl, norbornenyl, and camphenyl rings. These rearrangements therefore
几何和光学纯 (3R,5E)- 和 (3R,5Z)-1,5-heptadien-3-ols 在氧阴离子取向的排他控制下经历阴离子氧-Cope 重排,对赤道氧的偏好为 58-64%。还合成了六种半环二烯醇,其中优选的氧阴离子驱动的 sigmatropic 重排途径必须与 4-叔丁基环己烯基、降冰片烯基和凸轮苯基环提供的 π 面偏差相抗衡。因此,这些重排为控制手性转移水平和方向的那些因素提供了特别严格的测试。数据显示氧阴离子不喜欢参与 1,3-二轴关系