Jiang, Yi-Qian; Gu, Zheng-Yang; Chen, Ye; Xia, Ji-Bao published an article in 2021. The article was titled 《Pd-Catalyzed Amidation of Silyl Enol Ethers With CO and Azides via an Isocyanate Intermediate》, and you may find the article in Asian Journal of Organic Chemistry.SDS of cas: 16629-19-9 The information in the text is summarized as follows:
An efficient Pd-catalyzed amidation of silyl enol ethers to produce β-ketoamides I [R = Me, Ph, 4-MeC6H4, etc.; R1 = n-Bu, Ph, Bn, etc.; R2 = H, Me, Et; RR2 = (CH2)3] had been developed using carbon monoxide and sulfonyl azides. The tandem reaction provided a simple and straightforward approach for the synthesis of β-ketoamides I under mild conditions without any additive. The mechanistic studies indicated that the reaction undergoes via an in situ generated isocyanate intermediate. In the experiment, the researchers used many compounds, for example, Thiophene-2-sulfonyl chloride(cas: 16629-19-9SDS of cas: 16629-19-9)
Thiophene-2-sulfonyl chloride(cas: 16629-19-9) is a member of sulfonyl chlorides. Sulfonyl chlorides are reactive sulfonic acid derivatives similar in properties and reactivity to acid chlorides of carboxylates. The sulfonic acid group, however, is a highly hindered molecule, containing a tetrahedral configuration of substituents. SDS of cas: 16629-19-9
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics