An expedient one-pot sequential three-component reaction for the stereoselective synthesis of functionalized spiro-sulfamidate imine fused δ-lactone scaffold
作者:Debashis Majee、Soumen Biswas、Shaikh M. Mobin、Sampak Samanta
DOI:10.1016/j.tetlet.2014.06.088
日期:2014.8
A convenient one-pot three-component transformation between 4-aryl-5H-1,2,3-oxathiazole-2,2-dioxides, trans-β-aryl/alkyl-substituted acroleins and paraformaldehyde in CH2Cl2 at room temperature in the presence of commercially available l-proline and DBU as the organocatalysts has been successfully realized for the first time via a Michael-condensation-hemiacetalization sequence process. The resulting
在室温下于CH 2 Cl 2中进行4-芳基-5 H -1,2,3-氧杂噻唑-2,2-二氧化物,反式-β-芳基/烷基取代的丙烯醛和低聚甲醛的便捷的一锅三组分转化在商业上可获得的脯氨酸和DBU作为有机催化剂的存在下,通过迈克尔-缩合-半缩醛化序列方法已经成功地首次实现了室温下的温度调节。通过PCC对螺-δ-内酯进行原位氧化,获得了功能化的螺-氨基磺酰胺基亚胺稠合的δ-内酯支架,总产率良好至优异,非对映体比率中等至良好(最高dr5:1 dr)。此外,合成中有用的中间体的反式-顺式-β-氨基-α-叠氮基化合物已通过我们的方法成功获得。