The base-promoted isomerization of aziridines to allyl amines is still an almost unknown reaction. However, the use of superbasic reagents has shown to be able to promote a regio- and stereoselective conversion of monocyclic and bicyclic sulfonyl aziridines. Moreover, the use of alkoxy substituted aziridines opens new routes to non-natural alpha- and beta-amino acids. (C) 2002 Elsevier Science Ltd. All rights reserved.
A convenient and efficient ring-opening reaction of aziridines with acetylenes and synthesis of dihydropyrroles
作者:Chang-Hua Ding、Li-Xin Dai、Xue-Long Hou
DOI:10.1016/j.tet.2005.07.076
日期:2005.10
In the presence of tBuOK, reaction of acetylenes with N-Ts substituted aziridines derived from both cyclic and acyclic alkenes at room temperature gave rise to homopropargylamines in good to high yields and in high regioselectivity. Not only Ph- and Me3Si-substituted acetylenes but also acetylene itself was suitable reagents. Treatment of ring-opening products with I2 and AgOAc in the presence of K2CO3
在t BuOK的存在下,乙炔与室温下衍生自环状和无环烯烃的N -Ts取代的氮丙啶反应以高至高收率和高区域选择性产生了高炔丙胺。合适的试剂不仅是Ph和Me 3 Si取代的乙炔,而且乙炔本身也是合适的试剂。在K 2 CO 3存在下用I 2和AgOAc处理开环产物以高产率提供了二氢吡咯。还可以通过在NaH存在下氮丙啶和苯乙炔的反应,然后用I 2和AgOAc处理,实现一锅合成二氢吡咯。
An Efficient Ring-Opening Reaction of Aziridines with Alkynes Catalyzed by CuOTf
作者:Xue-Long Hou、Chang-Hua Ding、Li-Xin Dai
DOI:10.1055/s-2004-829551
日期:——
The alkynylation of activated aziridines in the presence of a catalytic amount of CuOTf provided the corresponding ring-opened products in high yields.
An Efficient and Highly Regioselective Fluorination of Aziridines Using BF<sub>3</sub>·OEt<sub>2</sub>as Fluorine Source
作者:Xue-Long Hou、Chang-Hua Ding、Li-Xin Dai
DOI:10.1055/s-2004-831319
日期:——
β-Fluoro amines were prepared from the reaction of aziridines and boron trifluoride in high regioselectivity and in high yield. All three fluorine atoms of BF 3 -OEt 2 were incorporated into the products when it reacted with aziridines.
Facile Preparation of β-Fluoro Amines by the Reaction of Aziridines with Potassium Fluoride Dihydrate in the Presence of Bu<sub>4</sub>NHSO<sub>4</sub>
作者:Ren-Hua Fan、Yong-Gui Zhou、Wan-Xuan Zhang、Xue-Long Hou、Li-Xin Dai
DOI:10.1021/jo034895k
日期:2004.1.1
Potassiumfluoride combined with tetrabutylammonium bisulfate is an efficient reagent to convert a variety of aziridines derived from cyclic and acyclic alkenes to β-fluoro amine derivatives in high yield.
Synthesis of β-Fluoro Amides Using Partially Hydrated Nickel Difluoride as Fluorine Source
作者:Wan Zhang、Li Su、Wei Hu、Jie Zhou
DOI:10.1055/s-0032-1317157
日期:——
beta-Fluoro amides were obtained from the reactions of activated aziridines with partially hydrated nickel difluoride (NiF2 center dot nH(2)O, n < 4) in good yields (47-82%) in the presence of tetra-n-butylammonium fluoride (20 mol%), while the non-activated aziridines did not react under the same conditions.