trans-Δ2-Anhydromevalonic acid (XVII) was prepared by a Wittig reaction, starting from (4-tetrahydro-2-pyranyloxy)-2-butanone. On the other hand, the corresponding 4-acetoxy-2-butanone gave, under similar conditions, the cyclohexene derivative V, explainable by a twofold Michael addition of the Wittig reagent to methyl vinyl ketone, followed by an intramolecular alcol condensation.
反式-Δ 2 -Anhydromevalonic酸(XVII)用制备维悌希反应,从(4-四氢-2-
吡喃基)-2-
丁酮开始。另一方面,在相似的条件下,相应的4-乙酰氧基-2-
丁酮产生了
环己烯衍
生物V,这可以通过将Wittig试剂两次迈克尔加成到甲基
乙烯基酮上,然后进行分子内醇缩合来解释。