naturally occurring (S)-(+)-carvone is described. The total number of steps was 28, and the overall yield was about 2.6%. The synthetic strategy for the construction of the tetracyclic carbon framework was based on a C-->ABC-->ABCD ring annulation sequence, involving an aldol reaction, an intramolecular Diels-Alder reaction, and an intramolecular acylation as the key steps. Subsequent functionalization
描述了由天然存在的(S)-(+)-
香芹酮的(+)-quassin的全合成。步骤总数为28,总产率约为2.6%。构建四环碳骨架的合成策略是基于C-> ABC-> AB
CD环的成环序列,其中涉及醛醇缩合反应,分子内Diels-Alder反应和分子内酰化反应为关键步骤。然后环A和环C的随后官能化提供了目标(+)-quassin。