A Tunable Route for the Synthesis of Azomethine Imines and β-Aminocarbonyl Compounds from Alkenes
摘要:
Cyclic azomethine imines possessing a beta-aminocarbonyl motif are accessed from simple alkene and hydrazone starting materials. A thermal, concerted alkene aminocarbonylation pathway involving an imino-isocyanate intermediate is proposed and supported by DFT calculations. A notable feature of the process is the steric shielding present in the dipoles formed, which allows for facile purification of the products by chromatography or crystallization. In addition, a fluorenone-derived reagent is reported, which provides reactivity with several alkene classes and allows for mild derivatization of the dipoles into beta-aminoamides, beta-aminoesters, and beta-amino acids.
Kinetic Resolution of Azomethine Imines by Brønsted Acid Catalyzed Enantioselective Reduction
作者:Amanda Bongers、Patrick J. Moon、André M. Beauchemin
DOI:10.1002/anie.201507548
日期:2015.12.14
Azomethine imines are valuable substrates in asymmetric catalysis, and can be precursors to β‐amino carbonyl compounds and complex hydrazines. However, their utility is limited because complex and enantioenriched azomethine imines are often unavailable. Reported herein is a kinetic resolution of N,N′‐cyclic azomethine imines by enantioselectivereduction (s=13–43). This resolution was accomplished