Synthesis of Functionalized 1,3-Thiazine Libraries Combining Solid-Phase Synthesis and Post-Cleavage Modification Methods
作者:Gernot A. Strohmeier、Willibald Haas、C. Oliver Kappe
DOI:10.1002/chem.200305658
日期:2004.6.21
increase the diversity. To reduce contamination, an on-bead purification of resin-bound 1,3-thiazines that makes use of differences in the reactivity of ester bonds toward alkoxides is reported. A final four-step post-cleavage modification of thiazine-5-carboxylates, derived by TFA cleavage from the Wang linker, leads to esters or amides. Twenty 1,3-thiazines were obtained in yields of up to 61 % over either
描述了在Wang树脂上固相合成不同组的1,3-噻嗪-5-羧酸盐。乙酰乙酰化,然后进行Knoevenagel缩合,并与硫脲进行酸促进的闭环反应,从而得到聚合物结合的1,3-噻嗪。作为酯交换反应的替代方法,从聚合物结合的丙二酸开始,通过与酰基咪唑反应,从头合成了β-酮酯,以提高多样性。为了减少污染,已报道了利用酯键对醇盐的反应性差异来对树脂结合的1,3-噻嗪进行珠上纯化的方法。通过TFA从Wang接头上裂解得到的噻嗪5-羧酸酯的最后四步裂解后修饰产生酯或酰胺。在9个步骤或13个步骤中,获得了20种1,3-噻嗪,产率高达61%。