Ni-Catalyzed Carboxylation of Aziridines en Route to β-Amino Acids
作者:Jacob Davies、Daniel Janssen-Müller、Dmitry P. Zimin、Craig S. Day、Tomoyuki Yanagi、Jonas Elfert、Ruben Martin
DOI:10.1021/jacs.1c01916
日期:2021.4.7
pressure is disclosed. The protocol is characterized by its mild conditions, experimental ease, and exquisite chemo- and regioselectivity pattern, thus unlocking a new catalytic blueprint to access β-aminoacids, important building blocks with considerable potential as peptidomimetics.
proceeds rapidly under mild conditions with high regioselectivity. Olefins react with TsNBr2 in moist THF to form δ-amino ether at roomtemperature. Treatment of TsNBr2 with olefin in MeCN at roomtemperature produced imidazoline in high yield. Further modification of the reaction condition resulted in the development of a one-step procedure for the synthesis of N-acetyl,N′-tosyl diamine derivatives directly
已经发现N,N-二溴-对甲苯磺酰胺(TsNBr 2)是用于各种氨基官能化反应的有效试剂。该试剂既可作为亲电子溴源,也可作为胺在不同条件下与烯烃反应,从而产生氨基醚,咪唑啉,二胺和氨基溴。该反应在温和条件下以高区域选择性快速进行。烯烃与TsNBr 2在潮湿的THF中反应,在室温下形成δ-氨基醚。在室温下,在MeCN中用烯烃处理TsNBr 2可以高产率生产咪唑啉。反应条件的进一步改变导致了一步合成步骤的发展。N-乙酰基,N'-甲苯磺酰基二胺衍生物直接来自烯烃。当烯烃与2.4摩尔当量TsNBr的处理2中K的存在2 CO 3,Ñ,Ñ在适中的产率获得'-ditosyl二胺衍生物。当在室温下在干燥的CH 2 Cl 2中用试剂处理烯烃时,观察到氨基溴的瞬时形成。
Lewis Base Catalyzed Ring Opening of Aziridines with Silylated Nucleophiles
The ringopening of N-tosylaziridines with trimethylsilylated nucleophiles, catalyzed by N,N,N',N'-tetramethylethylenediamine, led to the production of beta-functionalized sulfonamides in good to excellent yields with high regioselectivity. [reaction: see text]
PPh3/halogenating agent-mediated highly efficient ring opening of activated and non-activated aziridines
作者:Manoj Kumar、Sanjay K. Pandey、Shikha Gandhi、Vinod K. Singh
DOI:10.1016/j.tetlet.2008.11.009
日期:2009.1
We report here the use of PPh3/halogenating agents as highly efficient reagents for the ring opening of aziridines with halides. The method works effectively for both activated and non-activated aziridines, and furnishes the products in excellent yields within a short period of time.
The carbon dioxide (CO2)-induced amidobromination of olefins with bromamine-T is described. The method can be used in reactions with a wide range of olefins, both aromatic and aliphatic, as well as electron-rich and deficient olefins, leading to the regioselective formation of amidobrominated compounds.