SeO2 mediated efficient synthesis of amides and α-ketoamides of secondary amines with wide substrate scope
作者:Samdarshi Meena、Rohit Singh、Ram A. Vishwakarma、Mushtaq A. Aga、Shreyans K. Jain
DOI:10.1016/j.tetlet.2016.06.129
日期:2016.8
SeO2 mediated oxidative amidation of acetophenones, phenylacetylenes, and phenylacetaldehydes to α-ketoamides and aldehydes to amides is reported. Amidation selectively proceeds with secondary amines. α-Ketoamide derivatives of natural products 16-dehydropregnenolone acetate (8), pregnenolone acetate (10), and progesterone (11) were synthesized.
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。