Stereoselective Convergent Synthesis of 24,25-Dihydroxyvitamin D3 Metabolites: A Practical Approach
作者:José Pérez Sestelo、Iván Cornella、Olga de Uña、Antonio Mouriño、Luis A. Sarandeses
DOI:10.1002/1521-3765(20020617)8:12<2747::aid-chem2747>3.0.co;2-j
日期:2002.6.17
Vitamin D3 active metabolites 24R,25-(OH)2-D3, 24S,25-(OH)2-D3, and 1 alpha, 24R,25-(OH)3-D3 were synthesized by a convergent and stereoselective approach. In the synthetic route, the stereogenic center at C-24 was generated through ultrasonically induced aqueous conjugate addition of iodide 6 to Seebach's dioxolanone 5, and the vitamin D triene system was constructed using the Lythgoe approach. The
维生素D3活性代谢产物24R,25-(OH)2-D3、24S,25-(OH)2-D3和1 alpha,24R,25-(OH)3-D3通过聚合和立体选择性方法合成。在合成路线中,C-24的立体定位中心是通过将碘化物6超声诱导的水性共轭物加到Seebach's dioxolanone 5中而产生的,而维生素D三烯系统是用Lythgoe方法构建的。合成既短(从碘化物6到七个步骤),又很有效(总收率32-40%),可制备大量代谢物,并提供锌-铜促进的高度立体选择性反应的新实例夫妇在水性介质中。