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
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。
Synthesis of Tetrafunctionalized 2-Azido-3-hydroxy-1,4-diones and Their Transformation into 5-Substituted 3-Acylisoxazoles
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