Asymmetric Synthesis of Tetrahydroquinolin-3-ols via CoCl<sub>2</sub>-Catalyzed Reductive Cyclization of Nitro Cyclic Sulfites with NaBH<sub>4</sub>
作者:Arun R. Jagdale、R. Santhosh Reddy、Arumugam Sudalai
DOI:10.1021/ol8028109
日期:2009.2.19
construction of chiral 3-substituted tetrahydroquinoline derivatives based on asymmetric dihydroxylation and CoCl2-catalyzed reductive cyclization of nitro cyclic sulfites with NaBH4 has been described with high optical purities. This method has been successfully applied in the formal synthesis of PNU 95666E and anachelin H chromophore.
Studies on the synthesis of ammonificin A: New synthesis of trans-4-arylchroman-3-ols via intramolecular dehydrative Friedel–Crafts alkylation of 3-aryloxy-1-arylpropane-1,2-diols
作者:Arup Jyoti Das、Sajal Kumar Das
DOI:10.1016/j.tet.2023.133576
日期:2023.9
A synthesisroute which passes through a trans-4-arylchroman-3-ol intermediate enroute to the total synthesis of the marine natural product ammonificin A was designed and pursued. Initial model studies were focused on the development of suitable method for constructing trans-4-arylchroman-3-ol core and then its conversion into cis-3-aryloxy-4-arylchromane scaffold. In this context, a new strategy
设计并探索了一条通过反式-4-芳基苯并二氢吡喃-3-醇中间体全合成海洋天然产物ammonificin A的合成路线。最初的模型研究重点是开发合适的方法来构建反式-4-芳基苯并二氢吡喃-3-醇核心,然后将其转化为顺式-3-芳氧基-4-芳基苯并二氢吡喃支架。在此背景下,开发了一种新策略,通过3-芳氧基-1-芳基丙烷的分子内脱水弗里德尔-克来福特烷基化来制备在 C-4 芳基上带有邻位/对位-EDG 的反式-4-芳基苯并二氢吡喃-3-醇。 1,2-二醇。将反式-4-芳基苯并二氢吡喃-3-醇转化为顺式-3-芳氧基-4-芳基色满失败。使用四氟硼酸二苯基碘对顺式-4-芳基苯并二氢吡喃-3-醇中间体进行O-芳基化成功解决了这个问题。尽管取得了这些值得注意的成就,氨化素 A 的首次全合成仍然难以实现,因为这两种新开发的全合成方法的计划应用是灾难性的,因为常用的反应条件意外地阻碍了早期中间体丙酮化物部分的脱保护。