The Mukaiyama type aldol reaction for the synthesis of <i>trans</i>-2,6-disubstituted tetrahydropyrans: synthesis of diospongin A and B
作者:Yada Bharath、Utkal Mani Choudhury、N. Sadhana、Debendra K. Mohapatra
DOI:10.1039/c9ob01549c
日期:——
An efficient synthesis protocol for the preparation of trans-2,6-disubstituted tetrahydropyrans by the reaction of 1-phenyl-1-triemthylsiloxyethylene with six membered cyclic hemiacetals in the presence of iodine is developed. This reaction proceeds smoothly under mild conditions employing a catalytic amount of molecular iodine. The feature of this novel conversion includes milder reaction conditions
开发了一种有效的合成方案,用于在碘存在下通过1-苯基-1-三乙基甲硅烷氧基乙烯与六元环半缩醛的反应来制备反式2,6-二取代的四氢吡喃。该反应在温和条件下使用催化量的分子碘可以顺利进行。这种新型转化的特征包括较温和的反应条件,较宽的底物范围,官能团耐受性和良好的非对映选择性。本方法的效率和实用性成功地展示了双皂甙A和B的全合成,收率很高。