Synthesis of macrocyclic and medium-sized ring thiolactones <i>via</i> the ring expansion of lactams
作者:Kleopas Y. Palate、Ryan G. Epton、Adrian C. Whitwood、Jason M. Lynam、William P. Unsworth
DOI:10.1039/d0ob02502j
日期:——
A side chain insertion method for the ring expansion of lactams into macrocyclic thiolactones is reported, that can also be incorporated into Successive Ring Expansion (SuRE) sequences. The reactions are less thermodynamically favourable than the analogous lactam- and lactone-forming ring expansion processes (with this notion supported by DFT data), but nonetheless, three complementary protecting group
据报道,有一种侧链插入方法可将内酰胺环扩大成大环硫内酯,也可纳入连续环扩大(SuRE)序列中。该反应在热力学上不如类似的内酰胺和内酯形成环扩展过程(这一观点得到DFT数据的支持)低,但是尽管如此,已经开发了三种互补的保护基策略来实现这一具有挑战性的转化。