Chemodivergent annulations of allenyl imides and β,γ-enones switched by nucleophilic phosphine and amine catalysts
作者:Bingsen Xiang、Yuhao Wang、Chuqing Xiao、Fengkai He、Yiyong Huang
DOI:10.1016/j.cclet.2023.108777
日期:2024.1
chemodivergent [4 + 1] and [3 + 3] annulations of allenyl imides and β,γ-enones have been developed, furnishing highly substituted 2-cyclopentenone and 2-pyranone derivatives in moderate to excellent yields. Two plausible reaction mechanisms involving two different ketene intermediates have been proposed to explain the observed chemoselectivity. Moreover, by virtue of the α,β-enone substructure of the [4 + 1]
亲核膦和胺催化剂切换的联烯基酰亚胺和β,γ-烯酮的化学发散剂 [4 + 1] 和 [3 + 3] 环化已经开发出来,以中等至优异的产率提供高度取代的 2-环戊烯酮和 2-吡喃酮衍生物。已经提出了涉及两种不同乙烯酮中间体的两种可能的反应机制来解释观察到的化学选择性。此外,利用[4+1]加合物的α,β-烯酮亚结构,一锅法研究了腈亚胺的1,3-偶极环加成反应,得到了各种稠合吡唑啉衍生物。