Conjugate Additions to Phenylglycinol-Derived Unsaturated δ-Lactams. Enantioselective Synthesis of Uleine Alkaloids
作者:Mercedes Amat、Maria Pérez、Núria Llor、Carmen Escolano、F. Javier Luque、Elies Molins、Joan Bosch
DOI:10.1021/jo0487101
日期:2004.12.1
sulfur-stabilized anions) to the phenylglycinol-derived unsaturated lactams trans-2, cis-2, and its 8-ethyl-substituted analogue 10 is studied. The factors governing the exo or endo facial stereoselectivity are discussed. This methodology provides short synthetic routes to either cis- or trans-3,4-disubstituted enantiopure piperidines as well as efficient routes for the enantioselective construction of the tetracyclic
共轭加成的各种稳定的亲核试剂(2-吲哚烯醇化物和硫的稳定的阴离子)与苯基甘氨醇衍生的不饱和内酰胺的的立体化学结果反式- 2,顺式- 2,和它的8-乙基-取代的类似物10进行了研究。讨论了控制外向或内向面部立体选择性的因素。这种方法提供了合成顺式或反式的短途路线-3,4-二取代的对映体纯净的哌啶,以及在正常和20-epi系列中油酸碱生物碱的四环系统的对映选择性构建的有效途径。据报道该组几种生物碱的正式全合成。