2-(Phenylethynyl)isoborneol was synthesized by treatment of camphor with lithium phenylacetylide. Skeletal rearrangements of the title compound under the Ritter reaction conditions afforded a mixture of N-(4-phenylethynyl- and 4-benzoylmethyl-1,7,7-trimethylbicyclo[2.2.1]hept-2-yl)acetamides at a ratio of 8:3. The reaction of 2-(phenylethynyl)isoborneol with formic acid involved mainly Meyer-Schuster rearrangement instead of the expected Rupe rearrangement, and the major product was 2-(1,7,7-trimethylbicyclo[2.2.1]hept-2-ylidene)-1-phenylethanone. The minor product (∼6%) was 1-(2-hydroxy-1,7,7-trimethylbicyclo[2.2.1]hept-2-yl)-2-phenylethanone. The Ritter reaction of 2-(1,7,7-trimethylbicyclo[2.2.1]hept-2-ylidene)-1-phenylethanone selectively yielded N-(4-benzoylmethyl-1,7,7-trimethylbicyclo[2.2.1]hept-2-yl)acetamide.
2-(
苯乙炔基)异
龙脑是用苯乙酰化
锂处理
樟脑合成的。在里特反应条件下,对标题化合物进行骨架重排,得到了 N-(4-
苯乙炔基和 4-苯甲酰甲基-1,7,7-三甲基双环[2.2.1]庚-2-基)乙酰胺的混合物,两者的比例为 8:3。2-(phenylethynyl)isoborneol 与
甲酸的反应主要涉及 Meyer-Schuster 重排,而不是预期的 Rupe 重排,主要产物为 2-(1,7,7-三甲基双环[2.2.1]庚-2-亚基)-1-苯基乙酮。次要产物(6%)为 1-(2-羟基-1,7,7-三甲基双环[2.2.1]庚-2-基)-2-
苯乙酮。2-(1,7,7-三甲基双环[2.2.1]庚-2-亚基)-1-苯基乙酮的里特反应选择性地生成了 N-(4-苯甲酰甲基-1,7,7-三甲基双环[2.2.1]庚-2-基)乙酰胺。