Reaction of imines with hydroxyphenylketene which was produced by photolysis of cyclohexyl benzoylformate gave β-lactams in good yields.
亚胺与通过环己基苯甲酰基甲酸酯的光解而产生的羟基苯基烯酮的反应以良好的收率得到了β-内酰胺。
C–H/C–C Functionalization Approach to N-Fused Heterocycles from Saturated Azacycles
作者:Jin Su Ham、Bohyun Park、Mina Son、Jose B. Roque、Justin Jurczyk、Charles S. Yeung、Mu-Hyun Baik、Richmond Sarpong
DOI:10.1021/jacs.0c04278
日期:2020.7.29
Herein, we report the synthesis of substituted indolizidines and related N-fused bicycles from simple saturated cyclic amines through sequential C-H and C-C bond functionalizations. Inspired by the Norrish-Yang Type II reaction, C-H functionalization of azacycles is achieved by forming α-hydroxy-β-lactams from precursor α-ketoamide derivatives under mild, visible light conditions. Selective cleavage
在此,我们报道了通过连续的 CH 和 CC 键功能化,从简单的饱和环胺合成取代的吲哚里西啶和相关的 N-稠合双环。受 Norrish-Yang II 型反应的启发,氮杂环化合物的 CH 官能化是通过在温和的可见光条件下由前体 α-酮酰胺衍生物形成 α-羟基-β-内酰胺来实现的。使用Rh复合物选择性裂解α-羟基-β-内酰胺中的远端C(sp2)--C(sp3)键产生α-酰基中间体,该中间体经历连续的Rh催化脱羰基化,1,4加成到亲电子试剂和羟醛环化,得到包括吲哚里西啶的 N-稠合自行车。计算研究为观察到的 CC 裂解的位置选择性提供了机制上的见解,这在很大程度上取决于与膦配体的 Rh 反式结合的基团。
Chesta, Carlos A.; Whitten, David G., Journal of the American Chemical Society, 1992, vol. 114, # 6, p. 2188 - 2197
作者:Chesta, Carlos A.、Whitten, David G.
DOI:——
日期:——
Addition reaction of benzylbenzylidenenamine to lithium enolates of 1,3-dioxolan-4-one: synthesis of 2-phenylisoserines
The synthesis of two new 2-phenylisoserines, each bearing a quaternary stereocenter is described. These compounds, which are analogs of the amino acid side chain found in taxol and taxotere, were obtained by addition of the lithiumenolates of (2S,5S)-2-isopropyl-5-phenyl-1,3dioxolan-4-one and (2S,5S)-2-tert-butyl-2-methyl-5-phenyl-1,3-dioxolan-4-one to benzylbenzylideneamine in the presence of BF3