Divergent synthesis of α-functionalized amides through selective N–O/C–C or N–O/C–C/C–N cleavage of aza-cyclobutanone oxime esters
作者:Hua-Wei Liu、Dian-Liang Wang、Nan-Quan Jiang、Hai-Yan Li、Zhong-Jian Cai、Shun-Jun Ji
DOI:10.1039/d1cc03348d
日期:——
Herein, a novel sequential ring opening reaction of aza-cyclobutanone oxime esters with isocyanides is described. The reaction proceeded smoothly under redox-neutral and mild conditions, leading to a divergent synthesis of α-cyanomethylaminoamides, α-acyloxyamides and α-acylaminoamides. In these transformations, a selective N–O/C–C or N–O/C–C/C–N cleavage was achieved only by changing the iron-catalyst
A New Photolabile Linker for the Photoactivation of Carboxyl Groups
作者:K. C. Nicolaou、Brian S. Safina、Nicolas Winssinger
DOI:10.1055/s-2001-14661
日期:——
A new photolabile linker enabling nucleophilic cleavage of a carboxyl functionality upon irradiation with UV light (> 290 nm) was developed. When the photocleavage is carried out in the presence of primary or secondary amines, amides are obtained in high yields and purities, while the intramolecular version of this reaction leads to heterocycles via a cyclorelease mechanism.