spirastrellolides are a family of potent antimitotic agents isolated from the marine sponge Spirastrella coccinea. Synthetic studies toward the DEF bis-spiroacetal core of spirastrellolide B are reported. A modular approach was pursued by the use of two dithiane disconnections to enable a highly convergent synthesis. The ease of lithiation and nucleophilicity of these 2-substituted-1,3-dithianes were investigated
螺旋藻内酯是从海洋海绵
螺旋藻中分离出的一种有效的有丝分裂剂。已报道了对
螺旋藻内酯B的DEF双螺
缩醛核心的合成研究。通过使用两个二
噻吩断开连接来追求模块化方法,以实现高度收敛的合成。在合成过程中研究了这些2-取代的1,3-二
硫杂
环丁烷的易于
锂化和亲核性,发现烷基化在升高的温度下最有效地进行。[5,6,6]-双螺
缩醛环系统的形成是通过双二
噻吩脱保护/螺
缩醛化策略实现的。