Base-Induced Coupling of α-Azido Ketones with Aldehydes − An Easy and Efficient Route to Trifunctionalized Synthons 2-Azido-3-hydroxy Ketones, 2-Acylaziridines, and 2-Acylspiroaziridines
Base-Induced Coupling of α-Azido Ketones with Aldehydes − An Easy and Efficient Route to Trifunctionalized Synthons 2-Azido-3-hydroxy Ketones, 2-Acylaziridines, and 2-Acylspiroaziridines
Bifunctional squaramide catalyzed stereoselective Mannich reaction of α-azido ketones with isatin-derived ketimines
作者:Seda Karahan、Cihangir Tanyeli
DOI:10.1039/c9ob02208b
日期:——
Asymmetric organocatalytic Mannich reaction of α-azido ketones and N-Boc protected isatin-derived ketimines were investigated for the first time. Examination of both 2-adamantyl and 3,5-bis(trifluoromethyl)aniline substituted quinine-based squaramides afforded chiral Mannich bases with two contiguous stereogenic centers in high yields (up to 97%) and stereoselectivity (up to dr = 24 : 1 syn : anti
首次研究了α-叠氮基酮与N-Boc保护的由靛红衍生的酮亚胺的不对称有机催化曼尼希反应。检验2-金刚烷基和3,5-双(三氟甲基)苯胺取代的奎宁为基础的方酰胺,可得到具有两个连续立体生成中心的手性曼尼希碱,产率高(高达97%)和立体选择性(高达dr = 24:1 syn :anti和96%ee)。在代表性实例中利用了强杂环前体加合物的叠氮基和掩蔽的氨基官能团。
α-Azido Ketones, Part 8: Base-Induced Coupling of α-Azido Ketones with a 1,2-Diaza-1,3-diene as a Michael Acceptor
Carbanions generated from various acyclic and cyclic α-azido ketones in the presence of bases were reacted with ethyl 3-[(carbamoylimino)amino]but-2-enoate as a Michaelacceptor to give the corresponding adducts. The adducts of acyclic azides were unstable and eliminated hydrazoic acid to give the corresponding ethyl 2-[1-[(carbamoylamino)imino]ethyl]-4-oxo-4-phenylbut-2- enoates as (E,E/Z,E)-diastereomeric
在碱存在下,由各种无环和环状 α-叠氮酮生成的碳负离子与作为迈克尔受体的 3-[(氨基甲酰基亚氨基)氨基]丁-2-烯酸乙酯反应,得到相应的加合物。无环叠氮化物的加合物不稳定并消除了重氮酸,得到相应的 2-[1-[(氨基甲酰氨基)亚氨基]乙基]-4-氧代-4-苯基丁-2-烯酸乙酯,如 (E,E/Z,E )-非对映体混合物。这些非对映异构体的相对构型通过 X 射线分析确定。除 2-叠氮苯并丁酮外,环状 α-叠氮酮的加合物以非对映异构纯形式获得。
Base-Induced Coupling of α-Azido Ketones with Aldehydes − An Easy and Efficient Route to Trifunctionalized Synthons 2-Azido-3-hydroxy Ketones, 2-Acylaziridines, and 2-Acylspiroaziridines