Carbonyl Imines from Oxaziridines: Generation and Cycloaddition of NOC Dipoles
作者:Katherine M. Partridge、Ilia A. Guzei、Tehshik P. Yoon
DOI:10.1002/anie.200905801
日期:2010.1.25
Dipoles apart: Unusual 1,3‐dipolar carbonylimines are generated in the presence of a bulky scandium(III) catalyst by undergoing a Lewis acid catalyzed rearrangement of N‐sulfonyl oxaziridines. The 1,3‐dipolar carbonylimines then undergo subsequent cycloaddition with a variety of dipolarophiles. tmbox=2,2′‐isopropylidenebis(4,4‐dimethyl‐2‐oxazoline).
We developed an efficient method for synthesis of tetrafunctionalized 2-imidazolines using TfOH-catalyzed formal [3+2] cycloaddition of N-tosylaziridine dicarboxylates and nitriles. This is the first report of C-N bond cleavage of N-tosylaziridine dicarboxylates catalyzed by Brønsted acid and the reaction worked well over wide scope of substrates in good to excellent yields under mild conditions. The
A nickel(0)‐catalyzed hydroalkenylation of imines with styrene and its derivatives is described. A wide range of aromatic and aliphatic imines directly coupled with styrene and its derivatives, thus providing various synthetically useful allylic amines with up to 95 % yield. The reaction offers a new atom‐ and step‐economical approach to allylic amines by using alkenes instead of alkenyl‐metallic reagents
Synthesis of Diversely Substituted Imidazolidines
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[3+2] Cycloaddition of 1,3,5‐Triazinanes with Donor‐Acceptor Aziridines and Their Anti‐Tumor Activity
cycloaddition of 1,3,5-triazinanes with donor-acceptor aziridines has been developed, accessing diverselysubstituted imidazolidines high efficiency. Mechanistic investigations support the formation of imidazolidines through an SN1-like pathway. Furthermore, these imidazolidines exhibit promising anti-tumor activity against a series of human cancer cell lines.
已经开发了AY(OTf)3催化的供体-受体氮丙啶与1,3,5-三嗪并[3 + 2]环加成反应,可高效获得各种取代的咪唑烷。机理研究支持通过S N 1样途径形成咪唑烷。此外,这些咪唑烷类化合物显示出对一系列人类癌细胞系的有希望的抗肿瘤活性。
Palladium-catalyzed asymmetric umpolung allylation of imines with allylic alcohols
A palladium-catalyzedasymmetric umpolung allylation reaction of imines with allylicalcohols has been developed. In the presence of chiral spiro phosphoramidite ligand 4, the allylation was accomplished with high yields and good enantioselectivities. The use of highly stable and easily available allylicalcohols instead of allylic metal reagents facilitated the preparation of chiral homoallylic amines