The dehydrogenation reaction of a mixture of heptalene‐1,2‐ and heptalene‐4,5‐dimethanols 4a and 4b with basic MnO2 in AcOEt at room temperature led to the formation of the corresponding heptaleno[1,2‐c]furan‐1‐one 6a and heptaleno[1,2‐c]furan‐3‐one 7a (Scheme 2). Both products can be isolated by chromatography on silica gel. The methylenation of the furan‐3‐one 7a with 1 mol‐equiv. of Tebbe's reagent
室温下,庚二烯1,2-和庚烯-4,5-二
甲醇4a和4b与碱性MnO 2在AcOEt中的脱氢反应导致相应的庚二烯[1,2- c ]
呋喃- 1‐1 6a和heptaleno [1,2 ‐ c ]
呋喃‐3‐1 7a(方案2)。两种产物都可以通过
硅胶色谱法分离。
呋喃-3-1 7a与1摩尔当量的亚甲基化。的特伯氏试剂在-25至-30℃,得到2-异
丙烯基-5- methylheptalene -1-
甲醇9A,而不是预期的3,6- dimethylheptaleno [1,2 Ç
呋喃8(方案3)。另外,用高井氏试剂处理7a不会导致8a的形成。在室温下或在60°C下加热时更快地溶解,庚烯9a经历可逆的双键移位(
DBS)至9b,平衡比为1:1。