Hydroxymethylation of Quinolines with Na<sub>2</sub>
S<sub>2</sub>
O<sub>8</sub>
by a Radical Pathway
作者:Luan Zhou、Naoki Okugawa、Hideo Togo
DOI:10.1002/ejoc.201701321
日期:2017.11.9
Treatment of quinolines bearing methyl, fluoro, chloro, bromo, acetyl, methoxycarbonyl, trifluoromethyl, or cyano groups with Na2S2O8 in a mixture of methanol and water at 70 °C for 4 h gave the corresponding hydroxymethylated compounds in good to moderate yields. The hydroxymethyl group of the product was transformed into aldehyde, ester, amide, aminomethyl, cyano, and tetrazole groups.
在甲醇和水的混合物中,用Na 2 S 2 O 8在70°C下处理带有甲基,氟,氯,溴,乙酰基,甲氧基羰基,三氟甲基或氰基的喹啉4小时,得到相应的羟甲基化化合物中等产量。产物的羟甲基被转化为醛,酯,酰胺,氨甲基,氰基和四唑基。
The Ag-promoted α-C–H arylation of alcohols
作者:Shoufeng Wang、Shuya Xing、Yingying Zhang、Yafei Fan、Huaiqing Zhao、Jianfeng Wang、Shuxiang Zhang、Wengui Wang
DOI:10.1039/c9ra09954a
日期:——
We herein report the functionalization of α-C–H in alcohols through cross-dehydrogenative coupling reactions.
我们在此报告了通过交叉脱氢偶联反应在醇中的α-C-H上进行的官能化。
Spin-Center Shift-Enabled Direct Enantioselective α-Benzylation of Aldehydes with Alcohols
作者:Eric D. Nacsa、David W. C. MacMillan
DOI:10.1021/jacs.7b12768
日期:2018.3.7
two-electron pathways. We report herein an enantioselective α-benzylation of aldehydes using alcohols as alkylating agents based on the mechanistic principle of spin-center shift. This strategy harnesses the dual activation modes of photoredox and organocatalysis, engaging the alcohol by SCS and capturing the resulting benzylic radical with a catalytically generated enamine. Mechanistic studies provide
大自然通常使用醇作为离去基团,因为 DNA 生物合成依赖于通过自由基介导的“自旋中心转移”(SCS)机制从核糖核苷二磷酸中去除水。然而,由于醇在双电子途径中的低反应性,醇在合成化学中作为烷化剂仍然没有得到充分利用。我们在此报告了基于自旋中心位移的机械原理,使用醇作为烷化剂的醛的对映选择性 α-苄基化。该策略利用光氧化还原和有机催化的双重激活模式,通过 SCS 与醇结合,并用催化生成的烯胺捕获产生的苄基自由基。机理研究为 SCS 作为关键的基本步骤提供了证据,确定了竞争反应的起源,