Approaches to the synthesis of cytochalasans. Part 6. Synthesis of the C(14)-C(23) subunit of cytochalasins A, B. F and desoxaphomin
作者:Jean Ackermann、Nada Waespe-?ar?evi??、Christoph Tamm
DOI:10.1002/hlca.19840670132
日期:1984.2.1
The synthesis of methyl (4R, 8R,)-10-bromo-8-methyl-4-(1,3,6-trioxaheptane)-2-deceneoate (5), a synthon for the construction of the macrocyclic moieties of the cytochalasins A (1), B. (2) F (3) and desoxaphomin (4) is described. (S)-Glutamic acid (6) was transformed to the C5-epoxide 10 and 3-methylglutaric acid (11) to the C5-bromide 15. Coupling of both 10 and 15 by a CuI-catalyzed Grignard reaction
(4 R,8 R,)-10-溴-8-甲基-4-(1,3,6-三氧杂庚烷)-2-癸烯酸酯(5)的合成,该合成子用于构建环糊精的大环部分描述了细胞松弛素A(1),B。(2)F(3)和去氧磷精(4)。将(S)-谷氨酸(6)转化为C 5-环氧化物10,将3-甲基戊二酸(11)转化为C 5-溴化物15。通过CuI催化的格氏反应将10和15偶合得到癸醇16产量很高。后者通过几个步骤转换为合成子5。