Small-Ring Compounds. XLVII. Reactions of Optically Active Cyclopropylmethylcarbinyl Derivatives<sup>1,2a</sup>
作者:Martin Vogel、John D. Roberts
DOI:10.1021/ja00962a033
日期:1966.5
0-4% net inversion of configuration. Solvolysis of N-methyl-4- alkoxypyridinium salts was investigated as a means of providing a leaving group which would not undergo “internal return.” Solvolysis rates for N-methyl-4-(cyclopropylcarbinyloxy)pyridinium iodide and perchlorate in water and in 80% ethanol and of N-methyl-4-(cyclopropylmethylcarbinyloxy)pyridinium iodide in water were measured. The first-order
环丙基甲基甲醇胺和环丙基甲基甲醇被拆分成光学对映体,并且它们的构型相关。前者用亚硝酸水溶液脱氨基,得到具有 0-4% 构型净反转的后者。N-甲基-4-烷氧基吡啶鎓盐的溶剂分解被研究作为一种提供不会经历“内部返回”的离去基团的手段。测量了 N-甲基-4-(环丙基甲基羰基氧基)吡啶鎓碘化物和高氯酸盐在水中和80%乙醇中的溶剂分解速率以及N-甲基-4-(环丙基甲基羰基氧基)吡啶鎓碘化物在水中的溶解速率。N-甲基-4-(环丙基甲基羰基氧基)吡啶鎓碘化物在30℃水解的一级速率常数经计算为N-甲基-4-(环丙基甲基羰基氧基)吡啶鎓碘化物水解的6×10^3倍。光学活性的 N-甲基 4-(环丙基甲基甲醇氧基)碘化吡啶鎓的水解产生具有 4.4 ± 1.5% 构型反转的环丙基甲基甲醇。讨论了环丙基甲基羰基胺脱氨基和碘化 N 甲基-4-(环丙基甲基羰基氧基)吡啶鎓水解的立体化学以及环丙基甲基羰基和环丙基羰基吡啶