Sonochemical cleavage of 2-(bromomethyl)aziridines by a zinc–copper couple
摘要:
1-Alkyl- and 1-arylmethyl-2-(bromomethyl)aziridines are readily cleaved by the sonochemical zinc-copper couple in aqueous methanol at room temp. to afford allylamines.
Palladium-Catalyzed CH Activation of N-Allyl Imines: Regioselective Allylic Alkylations to Deliver Substituted Aza-1,3-Dienes
作者:Barry M. Trost、Subham Mahapatra、Martin Hansen
DOI:10.1002/anie.201501322
日期:2015.5.11
mode of activation of an imine via a rare aza‐substituted π‐allyl complex is described. Palladium‐catalyzed C(sp3)H activation of the N‐allyl imine and the subsequent nucleophilic attack by the α‐alkyl cyanoester produced the 1‐aza‐1,3‐diene as the sole regioisomer. In contrast, nucleophilic attack by the α‐aryl cyanoester exclusively delivered the 2‐aza‐1,3‐diene, which was employed in an inverse‐electron‐demand
An Effective Method To Prepare Imines from Aldehyde, Bromide/Epoxide, and Aqueous Ammonia
作者:Jing-Mei Huang、Jue-Fei Zhang、Yi Dong、Wen Gong
DOI:10.1021/jo102455q
日期:2011.5.6
three-component reaction of aldehydes, alkyl bromides, and ammonia to form imines was studied. Aqueous ammonia was applied as the nitrogen source and solvent in the reaction. For the aromatic aldehyde, the product yields are good to excellent and the reaction conditions are mild to be compatible with a range of functional groups. The reaction of aldehydes and aqueous ammonia with epoxides was also studied and
A convenient stereoselective preparation of meso- and cis-2,6-diarylpiperidin-4-ones has been developed by aza-Diels-Alder reaction catalyzed by l-proline from simple and commercially available starting materials.
Amine-catalyzed imino-Diels–Alderreactions of acyclic α,β-unsaturated ketones with imines have been developed. L-Proline catalyzed the in situ generation of 2-amino-1,3-butadienes to provide a stereoselective synthesis of meso-2,6-diaryl-4-piperidones in one direct step.
Electron transfer induced ring opening of 2-(bromomethyl)aziridines by magnesium in methanol
作者:Kourosch Abbaspour Tehrani、Tuyen NguyenVan、Michinori Karikomi、Mario Rottiers、Norbert De Kimpe
DOI:10.1016/s0040-4020(02)00728-7
日期:2002.8
Magnesium metal in methanol was used as a simple electron transfer induced ring-opening reagent of 2-(bromomethyl)aziridines to afford allylamines derivatives in 70-90% yield. (C) 2002 Elsevier Science Ltd. All rights reserved.