A Facile Deamination of Aziridines Using N2O4Under Very Mild Conditions
摘要:
Various aziridines reacted with N2O4 (2 eq) in the presence of Et3N ( 1 or 2 eq) in dry THF to give the corresponding ethylenes in good to excellent yields at (-23 degrees C or -43 degrees C) in 10 min under Ar.
The azirine formation by LAH reduction of oximes has been extended to several types, such asandThe result was satisfactory to generalization of this reaction.
通过LAH还原肟形成的叠氮基已扩展为多种类型,例如和,其结果对于该反应的一般化是令人满意的。
Efficient synthesis of ethyl 2-(oxazolin-2-yl)alkanoates via ethoxycarbonylketene-induced electrophilic ring expansion of aziridines
作者:Yelong Lei、Jiaxi Xu
DOI:10.3762/bjoc.18.6
日期:——
2-(oxazolin-2-yl)alkanoates in good to excellent yields under microwave heating. The method is a convenient and clean reaction without any activators and catalysts and can be also applied in the synthesis of 2-(oxazolin-2-yl)alkanamides and 1-(oxazolin-2-yl)alkylphosphonates.
Regio- and stereoselective synthesis of thiazoline derivatives <i>via</i> the thioketene-induced ring expansion of aziridines
作者:Qiuyue Wu、Jiaxi Xu
DOI:10.1039/d1cc06535a
日期:——
Metal-free thioketene-induced ring expansion of aziridines gave 4-alkylthiazolines stereospecifically from 2-alkylaziridines through an intramolecular substitution at the less substituted ring carbon and 5-arylthiazolines stereoselectively from 2-arylaziridines via tandem ring cleavage and formation through intimate ion-pair intermediates after nucleophilic addition of aziridines to thioketenes generated
Catalyst‐Free Electrophilic Ring Expansion of
<i>N</i>
‐Unprotected Aziridines with
<i>α</i>
‐Oxoketenes to Efficient Access 2‐Alkylidene‐1,3‐Oxazolidines
作者:Xingpeng Chen、Zhengshuo Huang、Jiaxi Xu
DOI:10.1002/adsc.202100320
日期:2021.6.21
2-(2-Oxoalkylidene)-1,3-oxazolidine derivatives were synthesized in good to excellent yields regiospecifically through the catalyst-free electrophilic ringexpansion of N-unprotected aziridines and the ketene C=O double bond of α-oxoketenes, in situ generated from the microwave-assisted Wolff rearrangement of 2-diazo-1,3-diketones. The ringexpansion predominantly underwent an SN1 process and the hydrogen
2-(2-氧代亚烷基)-1,3-恶唑烷衍生物通过无催化剂的N-未保护氮丙啶和α-氧代烯酮的烯酮C=O双键的无催化剂亲电子环膨胀,以良好到优异的产率区域特异性地合成,原位由 2-重氮-1,3-二酮的微波辅助沃尔夫重排产生。环膨胀主要经历了 S N 1 过程,氢键决定了产物的 ( E )-构型。
A Facile Deamination of Aziridines Using N<sub>2</sub>O<sub>4</sub>Under Very Mild Conditions
作者:Kieseung Lee、Yong Hae Kim
DOI:10.1080/00397919908086096
日期:1999.4
Various aziridines reacted with N2O4 (2 eq) in the presence of Et3N ( 1 or 2 eq) in dry THF to give the corresponding ethylenes in good to excellent yields at (-23 degrees C or -43 degrees C) in 10 min under Ar.