A Strategy for Accessing Aldehydes
<i>via</i>
Palladium‐Catalyzed C−O/C−N Bond Cleavage in the Presence of Hydrosilanes
作者:Zhanyu He、Zijia Wang、Junxiang Ru、Yulin Wang、Tingting Liu、Zhuo Zeng
DOI:10.1002/adsc.202000794
日期:2020.12.22
We report the catalytic reduction of both active esters and amides by selective C(acyl)−X (X=O, N) cleavage to access aldehyde functionality via a palladium‐catalyzed strategy. Reactions are promoted by hydrosilanes as reducing reagents with good to excellent yields and with excellent chemoselectivity for C(acyl)−N and C(acyl)−O bond cleavage. Carboxylic acid C(acyl)−O bonds are activated by 2‐chloro‐4
我们报告了选择性的C(酰基)-X(X = O,N)裂解,通过钯催化的方法获得醛官能团,从而催化活性酯和酰胺的催化还原。氢化硅烷作为还原剂可以促进反应,其收率好至极好,并且对C(酰基)-N和C(酰基)-O键的裂解具有出色的化学选择性。羧酸的C(酰基)-O键被2-氯-4,6-二甲氧基-1,3,5-三嗪(CDMT)活化形成三嗪酯中间体,该中间体进一步与氢硅烷反应在一个锅中生成醛两步过程。我们证明,与在相同反应条件下进行C(酰基)-N裂解相比,C(酰基)-O裂解/甲酰化可提供更高的收率和更宽的底物范围。