Ring-closing metathesis: development of a cyclisation–cleavage strategy for the solid-phase synthesis of cyclic sulfonamides
作者:Jean-Dominique Moriggi、Lynda J. Brown、José L. Castro、Richard C. D. Brown
DOI:10.1039/b313686h
日期:——
A series of novel 7-membered cyclic sulfonamides have been synthesised using a solid-phase cyclisationâcleavage RCM strategy. Model solution studies indicated the sulfonamides were suitable substrates for RCM using the Grubbs' catalyst 2. Starting from either 2-carboxyethyl polystyrene (21) or Merrifield resin, various seven-membered sulfonamides were prepared in good to excellent yields at low catalyst loadings (2.5â5 mol%) using a flexible spacer between the polymer and the substrate. In addition, a novel double-armed linker was shown to allow efficient RCM cleavage of sulfonamides with as little as 1 mol% of the ruthenium alkylidene complex 2.
我们采用固相环化-清除 RCM 策略合成了一系列新型 7 元环磺胺类化合物。模型溶液研究表明,磺酰胺类化合物是使用 Grubbs 催化剂 2 进行 RCM 的合适底物。 从 2- 羧乙基聚苯乙烯 (21) 或 Merrifield 树脂开始,使用聚合物和底物之间的柔性间隔物,以较低的催化剂负载量(2.5â5 mol%)制备了各种七元磺酰胺类化合物,产率从良好到极佳。此外,一种新型的双臂连接体被证明可以在钌亚烷基络合物 2 含量仅为 1 摩尔%的情况下高效地进行磺酰胺的 RCM 裂解。