A Unified Strategy toward the Synthesis of Acerogenin-Type Macrocycles: Total Syntheses of Acerogenins A, B, C, and L and Aceroside IV
作者:Gabriela Islas Gonzalez、Jieping Zhu
DOI:10.1021/jo981844s
日期:1999.2.1
A general strategy for the synthesis of acerogenin-type diarylheptanoids containing an endocyclic biaryl ether bond has been developed, and convergent total syntheses of acerogenin A, B, C, and L and aceroside IV have been accomplished. Cycloetherification of the linear diarylheptanoid 1-(4-fluoro-3-nitrophenyl)-7-(3-hydroxy-4-methoxyphenyl)heptan-3-one (18) under mild conditions (CsF, DMF, 0.01 M
已经开发了用于合成含有环内联芳基醚键的铜绿蛋白原型二芳基庚烷类化合物的一般策略,并且已经完成了铜绿蛋白原A,B,C和L以及皂苷IV的会聚总合成。线性二芳基庚烷1-(4-氟-3-硝基苯基)-7-(3-羟基-4-甲氧基苯基)庚烷-3-酮(18)在温和条件下(CsF,DMF,0.01 M,rt,5的环醚化) h)得到大环化合物4-甲氧基-17-硝基-2-氧杂三环[13.2.2(3,7)]二十碳-1(18),3,5,7(20),15(19),16-己烯-12一(19),产率95%。除去硝基,然后进行O-去甲基化,得到了金黄色素A(2),还原后得到了金黄色素A(1)。用2,3,4,6-α-D-四苯甲酰基吡喃葡萄糖基溴化物对2进行糖苷化,然后进行皂化,从而得到极好的总收率的皂苷IV(3)。以类似于线性化合物29的关键分子内S(N)Ar反应的方式合成了Acerogenins B(4)和L(5)。提出了环