Solid Phase Synthesis of Aminopropenonesand Aminopropenoates; Efficient and Versatile Synthons for CombinatorialSynthesis of Heterocycles
作者:Jacob Westman、Ronny Lundin
DOI:10.1055/s-2003-39156
日期:——
Simple and fast solid phase methods for the synthesis of heterocycles will be described. Two different three-step methods are presented. The first method includes esterifications of N-protected glycine derivatives to a solid support (Merrifield resin), formation of aminopropenoates and subsequent reaction with dinucleophiles. The second method includes methylamination of a Merrifield resin, formation of aminopropenones via in-situ formation of an active intermediate in a three-component reaction and finally treatment with dinucleophiles to form heterocycles. These procedures lead not only to the formation of heterocycles but also to simultaneous intramolecular cleavage of the products from the resin giving the product in pure form in the solution. In addition, the use of microwave dielectric heating enhanced the velocity of all reaction steps and was found to be a very efficient complement to the solid phase synthesis.
简单快速的固相合成杂环化合物方法将被描述。介绍了两种不同的三步骤方法。第一种方法包括将N-保护的甘氨酸衍生物酯化到固相载体(Merrifield树脂)上,形成氨基丙烯酸酯,随后与双亲核试剂反应。第二种方法包括对Merrifield树脂进行甲基化,通过三组分反应中活性中间体的原位形成来生成氨基丙烯酮,最后通过与双亲核试剂处理形成杂环。这些过程不仅导致了杂环的形成,还导致了产物从树脂上的同时分子内切割,使产物以纯形式存在于溶液中。此外,微波介电加热的使用提高了所有反应步骤的速度,并且被发现是对固相合成非常有效的补充。