4-HO-TEMPO-Catalyzed Redox Annulation of Cyclopropanols with Oxime Acetates toward Pyridine Derivatives
作者:Jun-Long Zhan、Meng-Wei Wu、Dian Wei、Bang-Yi Wei、Yu Jiang、Wei Yu、Bing Han
DOI:10.1021/acscatal.9b00832
日期:2019.5.3
for the synthesis of pyridines through the annulation of cyclopropanols and oxime acetates has been developed. This protocol features good functional group tolerance and high chemoselectivity and also promises to be efficient for the late-stage functionalization of skeletons of drugs and natural products. Mechanism studies indicate that the reaction involves the in situ generated α,β-unsaturated ketones
Na
<sub>2</sub>
S
<sub>2</sub>
O
<sub>8</sub>
‐Promoted Radical Cyclization for the Synthesis of Azaspiro[4.5]deca‐3,6,9‐triene‐2,8‐dione and Pyrrolo[2,1‐
<i>j</i>
]quinolone Derivatives
An efficient radicalcyclization of N‐(4‐methoxyphenyl)‐N‐methyl‐3‐phenylpropiolamides with 1‐phenylcyclopropan‐1‐ols has been achieved using Na2S2O8 to produce azaspiro[4.5]deca‐3,6,9‐triene‐2,8‐diones. Similarly, the reaction of 1‐[6‐methoxy‐3,4‐dihydroquinolin‐1(2H)‐yl]‐3‐phenylprop‐2‐yn‐1‐ones with 1‐phenylcyclopropan‐1‐ols gives 6,7‐dihydro‐3H‐pyrrolo[2,1‐j]quinoline‐3,9(5H)‐diones.
使用Na 2 S 2 O 8生成氮杂螺[4.5] deca-3,6,可以有效地将N-(4-甲氧基苯基)-N-甲基-3-苯基丙酰胺与1-苯基环丙烷-1-醇进行自由基环化。9-三烯-2,8-二酮。同样,1- [6-甲氧基-3,4-二氢喹啉-1(2 H)-基] -3-苯基丙-2-炔-1-酮与1-苯基环丙-1-醇的反应得到6,7二氢-3- ħ吡咯并[2,1- Ĵ ]喹啉-3,9-(5 ħ) -二酮。
Ring-Opening Selenation of Cyclopropanol for the Selective Synthesis of β-Hydroxy-Substituted Selenylated Ketones
belong to monofunctional ketones, while difunctional ketones with more potential application value have been rarely reported. Herein, we first reported a mild I2-promoted ring-opening selenation of cyclopropanol to synthesize various distal difunctional ketones. In the reaction, hydroxyl (−OH) derived from water and RSe+ from diselenide can be introduced into the α- and β-positions, respectively, delivering