Approaches to the Synthesis of Cytochalasans Part9. A versatile concept leading to all structural types of cytochalasans
作者:Jean Ackermann、Michael Matthes、Christoph Tamm
DOI:10.1002/hlca.19900730113
日期:1990.1.31
Starting from D-glutamic acid (5), the bicyclic compounds 4a and 4b were synthesized via17 (Schemes 1 and 2). The reaction leading to 4g and 4h with LiCuPh2 was not successful. But treatment of the N-protected model lactams 19, 21, and 22 with Li2Cu(CN)Ph2 gave the amino ketones 24, 26, and 27, respectively (Scheme 3). The desired compound 23 was obtained from 20. Conversion of the unprotected lactams
从D-谷氨酸(5)开始,通过17(方案1和2)合成了双环化合物4a和4b。用LiCuPh 2导致4g和4h的反应不成功。但治疗N-保护的模型的内酰胺19,21,和22与Li 2的Cu(CN)PH 2,得到氨基酮24,26,和27,分别为(方案3)。所需化合物23从得到20转换未受保护内酰胺的28,31,和32,得到苯基衍生物34以优良产率。酯35被转化为α-氨基-γ-氧代酸衍生物36。这种转化打开了对这类化合物的新颖途径。