Synthetic Studies Towards the Core Structure of Nakadomarin A by a Thioamide-Based Strategy
作者:Jai K. Chavda、Panayiotis A. Procopiou、Peter N. Horton、Simon J. Coles、Michael J. Porter
DOI:10.1002/ejoc.201301063
日期:2014.1
The tricyclic BCD substructure of the marine natural product nakadomarin A has been synthesised. The strategy utilised a key carbon–carbon bond-forming reaction between a furan and an N-acyliminium ion derived from a secondary thiolactam. In addition, a novel three-component coupling reaction between a thioamide, an allylic bromide and an isocyanate, leading to the establishment of two new stereogenic
已合成海洋天然产物 nakadomarin A 的三环 BCD 亚结构。该策略利用了呋喃和衍生自二级硫内酰胺的 N-酰基胺离子之间的关键碳-碳键形成反应。此外,还报道了硫代酰胺、烯丙基溴和异氰酸酯之间的新型三组分偶联反应,导致建立两个新的立体中心。通过使用硫代酰胺的独特化学,已经实现了 nakadomarin A 计划全合成的两个关键步骤。碳环 B 环的形成可以通过呋喃对硫内酰胺衍生的亚胺离子的亲核攻击来实现,并且关键的季铵中心可以通过新型的三组分偶联反应建立。