Aldol Condensations on a 3-Alkylidene-2,5-diketopiperazine: Synthesis of Two Marine Natural Products
作者:Magnus Fairhurst、Muhammad Zeeshan、Bengt Haug、Annette Bayer
DOI:10.1055/s-0036-1591755
日期:2018.6
The synthesis of two marine natural products containing a 3-alkylidene-6-arylidene-2,5-diketopiperazine scaffold by employing two consecutive aldol condensations starting with 1,4-diacetyl-2,5-diketopiperazine is reported. The target compounds contain a phenol or an imidazole group as aryl substituents, respectively, and suitable conditions for the aldol condensation of 1-acyl-3-alkylidene-2,5-diketopiperazine
据报道,通过采用两个连续的 aldol 缩合,以 1,4-二乙酰-2,5-二酮哌嗪开始,合成了含有 3-亚烷基-6-亚芳基-2,5-二酮哌嗪支架的两种海洋天然产物。目标化合物分别含有苯酚或咪唑基团作为芳基取代基,并开发了 1-酰基-3-亚烷基-2,5-二酮哌嗪与所需官能化芳香醛的羟醛缩合的合适条件。如果使用最佳碱,酚基的引入不需要使用保护基。Boc-保护有利于咪唑基团的引入,并确定了一步进行羟醛缩合和Boc-脱保护的条件。目标化合物的立体化学经核磁共振分析证实。