diketopiperazines is an apt description of the variecolortides, a family of unusual fungal alkaloids. In a new, concise total synthesis of the variecolortides A and B, the natural racemates are obtained highly convergently and almost without protecting‐group manipulations. The spirocyclic core is generated in a hetero‐Diels–Alder reaction of a 1,4‐anthraquinone with a didehydrodiketopiperazine.
某些
蒽醌和二酮
哌嗪的融合体是对variecolortides(一种不寻常的真菌
生物碱家族)的恰当描述。在新的,简洁的变色色素A和B的总合成中,天然外消旋物的聚合程度很高,几乎没有保护基团的操纵。螺环核心是由1,4-
蒽醌与二氢二酮
哌嗪的异Diels-Alder反应生成的。