An iridium-catalyzed C–H allylation of acrylamides with conjugated dienes was developed, using NH-Ts amide as the directing group. The ligand- and additive-free protocol provided a convenient and atom economic synthesis of branched 1,4-diene skeletons, enabling the tolerance of a wide scope of functionalities such as OMe, F, Cl, Br and CF3. The utility of this protocol is also demonstrated by a preparative
Catalyst‐Free Electrosynthesis of Benzimidazolones through Intramolecular Oxidative C−N Coupling
作者:Jiang‐Sheng Li、Pan‐Pan Yang、Xin‐Yun Xie、Si Jiang、Li Tao、Zhi‐Wei Li、Cui‐Hong Lu、Wei‐Dong Liu
DOI:10.1002/adsc.202000198
日期:2020.5.12
The electrochemicalsynthesis of N, N’‐disubstituted benzimidazolones from ureas through an intramolecular anodic dehydrogenative N−H/C−H coupling has been developed. The reaction undergoes under the undivided electrolysis conditions and obviates the need for any catalysts and chemical oxidants.
simplest alkoxycarbonylnitrene, CH3OC(O)N, has been generated through laser (266 and 193 nm) photolysis of CH3OC(O)N3 and CH3OC(O)NCO and subsequently characterized by IR (15N, D-labelling) and EPR (|D/hc| = 1.66 cm−1 and |E/hc| = 0.020 cm−1) spectroscopy in cryogenic matrices. Two conformers of the nitrene, with the CH3 group being in syn or anti configuration to the CO bond, have been unambiguously identified
最简单的烷氧基羰基氮烯CH 3 OC(O)N是通过激光(266和193 nm)对CH 3 OC(O)N 3和CH 3 OC(O)NCO进行光解而生成的,其特征在于IR(15 N, D标记)和EPR(| D / hc | = 1.66 cm -1和| E / hc | = 0.020 cm -1)光谱。氮的两个构象异构体,CH 3基团与C呈顺式或反式构型O键,已被明确鉴定。腈的进一步紫外线照射(365 nm)导致异构化为CH 3 ONCO,完成了CH 3 OC(O)N 3的Curtius重排的常用机理。