In 2022,Shen, Li-Wen; Wang, Zhen-Hua; You, Yong; Zhao, Jian-Qiang; Zhou, Ming-Qiang; Yuan, Wei-Cheng published an article in Organic Letters. The title of the article was 《α-Nitrosostyrenes as Three-Atom Units for the (3+1) Cyclization Reaction: Facile Access to 2,3-Dihydrodiazete N-Oxides and Their Diversified Synthetic Conversions》.Electric Literature of C5H11NO3 The author mentioned the following in the article:
An unprecedented (3 + 1) cyclization of α-nitrosostyrenes, in situ generated from α-bromooximes, and N-tosyloxycarbamates was developed, which enables the synthesis of a range of structurally unique and hitherto unexplored 2,3-dihydrodiazete N-oxides in moderate to high yields. The products possess a highly strained four-membered ring structure containing two nitrogen atoms. The synthetic applicability of the products was also demonstrated by many important conversions to diverse nitrogen-containing compounds After reading the article, we found that the author used N-tert-Butoxycarbonylhydroxylamine(cas: 36016-38-3Electric Literature of C5H11NO3)
N-tert-Butoxycarbonylhydroxylamine(cas: 36016-38-3) belongs to anime. Acylation is one of the most important reactions of primary and secondary amines; a hydrogen atom is replaced by an acyl group (a group derived from an acid, such as RCOOH or RSO3H, by removal of ―OH, such as RC(=O)―, RS(O)2―, and so on). Reagents may be acid chlorides (RCOC1, RSO2C1), anhydrides ((RCO)2O), or even esters (RCOOR′); the products are amides of the corresponding acids.Electric Literature of C5H11NO3
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics