作者:Michelle M. Claffey、Christopher J. Hayes、Clayton H. Heathcock
DOI:10.1021/jo9910987
日期:1999.10.1
A synthetic approach was developed to the C1-C28 subunit of spongistatin 1 (altohyrtin A, 65). The key step was the coupling of the AB and CD spiroketal moieties via an anti-aldol reaction of aldehyde 62 and ethyl ketone 57. The development of a method for the construction of the AB spiroketal fragment is described and included the desymmetrization of C(2)-symmetric diketone 10 and the differentiation
开发了一种合成方法用于海绵抑素1的C1-C28亚基(altyryrtin A,65)。关键步骤是通过乙醛62和乙基酮57的抗醛醇缩合反应偶联AB和CD螺酮基团部分。描述了AB螺酮基团片段构建方法的开发,包括C(2)的去对称化对称的二酮10和两种伯醇的16的区别。进一步将此高级中间体精制为所需的醛62包括Evans的顺式羟醛反应和Tebbe烯烃化反应。CD螺旋酮片段56的合成涉及通过45的脱保护原位产生的三醇-二酮的缩酮化,以分别提供有利比例(6-7∶1)的螺旋酮异构体46和47。总体保护集团战略,