Stereoselective synthesis of heterosubstituted aziridines and their functionalization
摘要:
Lithiated (alpha-chloroalkyl)heterocycles, generated by deprotonation with LDA at -78 degreesC in THF, add to various enantiopure imines affording 'one pot' chiral heterosubstituted aziridines in a diastereoselective manner. Lithiated heterosubstituted aziridines, obtained by deprotonation of the corresponding aziridines with n-BuLi at -78 degreesC in THF, were trapped by electrophiles (D2O or CH3I) with high stereoselectivity. (C) 2003 Elsevier Ltd. All rights reserved.
[2+2] Carbonylative cycloaddition catalyzed by palladium: stereoselective synthesis of β-lactams
作者:Luigino Troisi、Luisella De Vitis、Catia Granito、Tullio Pilati、Emanuela Pindinelli
DOI:10.1016/j.tet.2004.05.079
日期:2004.8
[2+2] Carbonylativecycloaddition of chiral imines to various allyl halides, under CO pressure, in the presence of Et3N, a catalytic amount of Pd(OAc)2 and PPh3 as ligand, are carried out. Separable diastereomeric mixtures of chiral alkenyl-β-lactams are isolated with good yields and high trans diastereoselections. Absolute configurations are assigned by X-ray measurements and 1H NMR spectroscopy.
[2 + 2]在Et 3 N存在下,在CO压力下,在CO压力下,将手性亚胺羰基化成环烷基加成各种烯丙基卤,催化量的Pd(OAc)2和PPh 3作为配体。手性烯基-β-内酰胺的可分离的非对映异构体混合物具有良好的收率和较高的反式非对映体选择性。通过X射线测量和1 H NMR光谱确定绝对构型。
Preparation of Stereodefined Homoallylic Amines from the Reductive Cross-Coupling of Allylic Alcohols with Imines
作者:Ming Z. Chen、Martin McLaughlin、Masayuki Takahashi、Michael A. Tarselli、Dexi Yang、Shuhei Umemura、Glenn C. Micalizio
DOI:10.1021/jo101535d
日期:2010.12.3
provide a means to translate the stereochemical information of the allylic alcohol to the homoallylic amine or to control diastereoselection in the coupling reactions of achiral allylic alcohols with chiralimines. Double asymmetric coupling reactions are also described that afford a unique means to control stereoselection in these complex convergent coupling processes. Finally, empirical models are
A spectacular inversion of alpha- to gamma-regioselectivity in the allylzincation of imines can be achieved by fine-tuning of the N-side chain. This approach allows easy preparation of regioisomeric amines, in racemic as well as enantiopure forms. The usefulness of the method is illustrated by the parallel asymmetric syntheses of 2,3- and 2,5-diphenylpyrrolidines.
Facile Asymmetric Synthesis of Aziridine Derivatives via the Diastereoselective Reaction of Chiral Imines with Dimethylsulfonium Methylide
A simple method for the synthesis of chiral 2-substituted aziridine derivatives is described. The reaction pathway consists of the diastereoselective addition of dimethylsulfonium methylide to chiral imines derived from (R)-phenylglycinol and various aldehydes.
Yuan, Chengye; Li, Shusen; Wang, Guoquan, Phosphorus, Sulfur and Silicon and the Related Elements, 1993, vol. 81, # 1-4, p. 27 - 36