据报道,前所未有的Mn I / Ag I中继催化(乙烯基)芳烃与α-重氮酮的C(sp 2)-H / C(sp 3)-H偶联,其中重氮基被用作无痕助剂控制区域选择性。具有挑战性的β-(杂)芳基/烯基酮是通过这种操作简单的方法获得的。级联过程合并了脱氮,卡宾重排,CH活化和加氢芳基化/加氢烯基化。该方法的鲁棒性已在制备规模上得到证明,并应用于天然产物的后期多样化。
Copper-catalyzed methylation of 1,3-diketones with tert-butyl peroxybenzoate
作者:Zhi-Hao Zhou、Cheng-Kun Li、Shao-Fang Zhou、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1016/j.tet.2017.03.058
日期:2017.5
Copper-catalyzed radical methylation of 1,3-diketones with tert-butyl peroxybenzoate in air is described, providing a general pathway to α-methyl 1,3-diketones in moderate to good yields. This protocol has been scaled up to 50 g, and one of the synthesized products can be used in the synthesis of medicine, Rosuvastatin.
Deuteration Degree‐Controllable Methylation via a Cascade Assembly Strategy using Methylamine‐Water as Methyl Source
作者:Fuhu Guo、Shiquan Shan、Xu Gong、Cancan Dai、Zhengjun Quan、Xiamin Cheng、Xinyuan Fan
DOI:10.1002/chem.202301458
日期:2023.8.10
Methylamine-water system was developed as a new methyl source for the methylation of β-diketones under mild photocatalytic reaction conditions. Degree-controllable deuterated methylation could be easily achieved by using distinct combinations of d-methylamine-D2O system, allowing for the synthesis of deuterium-labelled bioactive molecules with a controllable number ranging from 0 to 3.
An unprecedented MnI/AgI‐relay‐catalyzed C(sp2)−H/C(sp3)−H coupling of (vinyl)arenes with α‐diazoketones is reported, wherein the diazo group was exploited as a traceless auxiliary for control of regioselectivity. Challenging β‐(hetero)aryl/alkenyl ketones were obtained through this operationally simple approach. The cascade process merges denitrogenation, carbene rearrangement, C−H activation, and
据报道,前所未有的Mn I / Ag I中继催化(乙烯基)芳烃与α-重氮酮的C(sp 2)-H / C(sp 3)-H偶联,其中重氮基被用作无痕助剂控制区域选择性。具有挑战性的β-(杂)芳基/烯基酮是通过这种操作简单的方法获得的。级联过程合并了脱氮,卡宾重排,CH活化和加氢芳基化/加氢烯基化。该方法的鲁棒性已在制备规模上得到证明,并应用于天然产物的后期多样化。