Chiral building blocks from d-xylose and their application in synthesis of avocadotriol monoacetate
作者:Jian Gao、Zhi-Bin Zhen、Ya-Jun Jian、Yikang Wu
DOI:10.1016/j.tet.2008.07.103
日期:2008.9
Facile routes to several enantiomerically pure flexible chiral building blocks carrying a hidden syn or anti 1,3-diol motif were developed with the inexpensive and readily available carbohydrate d-xylose as the starting material. Application of the newly developed chiral building blocks in total synthesis is exemplified through a synthesis of (2S,4S)- and (2S,4R)-avocadotriol. Both triols were selectively
以廉价且易于获得的碳水化合物d-木糖为原料,开发了通往带有对映体纯净的柔性手性结构单元的简便途径,这些手性结构单元具有隐藏的合成或反1,3-二醇基序。通过合成(2 S,4 S)-和(2 S,4 R)-鳄梨三醇来举例说明新开发的手性结构单元在总合成中的应用。用诺维信435 /乙酸乙烯酯高产率地将两种三醇选择性地在伯羟基上乙酰化。根据1 H NMR,旋光度和熔点数据的比较,将天然鳄梨三醇1-单乙酸酯定为(2 R,4 R)配置。