Selective functionalization at the α-methyl group of 1-substituted pyridin-2(1H)- and 4(1H)-ones (2- and 4-pyridones) can be achieved by appropriate choice of base. 发现正丁基锂可实现 1-苄基-2-和-4-吡啶酮衍生物的清洁 6(2)-甲基去质子化,而六甲基二硅肼钾 (KHMDS) 是相应 1-甲基-2 甲基去质子化的首选试剂- 和 -4-吡啶酮。去质子化在 –78 °C 下顺利进行,生成的阴离子在精确的温度控制下很容易与各种亲电子试剂(醛、酮、烷基化试剂和偶氮化合物)反应,形成有用的功能化 2- 和 4- 吡啶酮和喹嗪酮.
Disclosed are compounds of Formula 1 including all geometric and stereoisomers, N-oxides, and salts thereof, (I) wherein Z, X, R1, R2, W, R3, R4a, R4b, L, R5a, R5b and Q are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling plant disease caused by a fungal pathogen comprising applying an effective amount of a compound or a composition of the invention.
Addition of novel benzylmagnesium “ate” complexes of BnR2MgLi type to 2-(thio)pyridones and related compounds
作者:Jacek G. Sośnicki、Tomasz Idzik、Aleksandra Borzyszkowska、Emil Wróblewski、Gabriela Maciejewska、Łukasz Struk
DOI:10.1016/j.tet.2016.12.024
日期:2017.2
Novel benzylation reagents BnR2MgLi were obtained by mixing benzylmagnesium chloride (BnMgCl) and appropriate organolithiumcompounds (RLi). As BnR2MgLi complexes are more nucleophilic than the parent Grignardcompound they enabled regioselective C6-addition to electrophilic N-substituted 2-(thio)-pyridones and C4-addition to poorly reactive NH 2-(thio)pyridones in high and good yields, respectively
also display distinct site-selectivity toward C-H activation of pyridone and pyridine derivatives. In particular, a completely C4-selective alkenylation of pyridine has been achieved for the first time. Meanwhile, the present catalytic system proved to promote exclusively C5-selective alkenylation of imidazo[1,2-a]pyridine derivatives. Mechanistic studies including DFT calculations on the Co/Al-catalyzed
A Manganese-promoted direct oxidative C−P bond formation between 2-pyridones and secondary phosphine oxides has been developed. The reported protocol proceeds under mild reaction conditions, and the C3-phosphinoylation is proposed to take place under a radical process in the presence of substoichiometric amount of Mn(II).
作者:Shanqing Tao、Jiaxi Xiao、Yadong Li、Fengxia Sun、Yunfei Du
DOI:10.1002/cjoc.202100278
日期:2021.9
The reaction of pyridin-2(1H)-ones with PhICl2 and NH4SCN enables an efficient regioselective thiocyanation, leading to the synthesis of the biologically interesting C5 thiocyanated 2-pyridones in good to high yields. The mechanistic pathway of this metal-free approach is postulated to involve the formation of the reactive thiocyanogen chloride from the reaction of PhICl2 and NH4SCN followed with the
吡啶-2(1 H )-酮与PhICl 2和NH 4 SCN 的反应可实现有效的区域选择性硫氰化,从而以良好或高产率合成具有生物学意义的C5 硫氰化2-吡啶酮。这种无金属方法的机械途径被假定为涉及从 PhICl 2和 NH 4 SCN的反应形成反应性氯化硫氰,然后是吡啶-2(1 H )-一个环的区域选择性亲电硫氰化。