Synthesis of threo-β-aminoalcohols from aminoaldehydes via chelation-controlled additions. Total synthesis of l-threo sphingosine and safingol
作者:Michael E. Jung、Sung Wook Yi
DOI:10.1016/j.tetlet.2012.05.153
日期:2012.8
threo-β-amino alcohol derivatives through chelation with the carbamoyl moiety. The carbamate group is a stronger chelating group than other potentially good chelators, for example ethers, esters, thioethers, and gives good diastereoselectivity with cuprates. Thus addition of lithium divinylcuprate to the aldehyde generated from the serine derivative 25 in the presence of extra copper for chelation
由功能化氨基酸制备的N-氨基甲酰基氨基醛螯合控制的有机铜酸酯的添加主要通过与氨基甲酰基部分的螯合生成苏-β-氨基醇衍生物。氨基甲酸酯基团是比其他潜在的良好螯合剂(例如醚,酯,硫醚)更强的螯合基团,并且对铜酸盐具有良好的非对映选择性。因此,在额外的铜的存在下,将二乙烯基铜酸锂添加到由丝氨酸衍生物25产生的醛中进行螯合,以83%的收率得到苏式化合物26。保护基团的交叉复分解和裂解提供了l-苏式鞘氨醇21。另外,通过这种方法,由市售的O-苄基N -BOC丝氨酸28以六个步骤制备了溶血鞘脂蛋白激酶C抑制剂safingol,22,其总产率为56%。