In Situ Generation and Intramolecular Schmidt Reaction of Keto Azides in a Microwave-Assisted Flow Format
作者:Thomas O. Painter、Paul D. Thornton、Mario Orestano、Conrad Santini、Michael G. Organ、Jeffrey Aubé
DOI:10.1002/chem.201100768
日期:2011.8.22
Go with the flow! A method for conversion of keto halides to lactams by means of sequential azidation and intramolecularSchmidtreaction in a combined flowformat is described (see scheme; MWI=microwave irradiation, TFA=trifluoroacetic acid).
Hypervalent organoiodine reagents in the transannular functionalisation of medium-sized lactams: synthesis of 1-azabicyclo compounds
作者:R. L. Dorta、C. G. Francisco、E. Suárez
DOI:10.1039/c39890001168
日期:——
produced by photolysis of medium-sizedlactams 7-heptanelactam (1), 8-octanelactam (3), and 9-nonanelactam (6) in the presence of (diacetoxyiodo)benzene (DIB) and iodine, undergo transannular hydrogen abstraction to afford intermolecularly functionalised compounds such as oxoindolizidines (4) and (5) and the 1-azabicyclo[5.3.0]decan-2-one (7) that are obtained in high yield from lactams (3) and (6), respectively
Rearrangements of Bicyclic Nitrones to Lactams: Comparison of Photochemical and Modified Barton Conditions
作者:Yibin Zeng、Brenton T. Smith、John Hershberger、Jeffrey Aubé
DOI:10.1021/jo035004b
日期:2003.10.1
The rearrangement of nitrones to lactams can be carried out by photochemical activation or by treatment with Tf(2)O followed by KOH-promoted rearrangement (a modification of conditions originally introduced by Barton). Substrates in which the nitrone is part of a fused bicyclic ring system have traditionally proven problematic for this kind of reaction. In this study, a series of mono-, bi-, and tricyclic
Intramolecular Schmidt reactions of alkyl azides with ketals and enol ethers
作者:Craig J. Mossman、Jeffrey Aubé
DOI:10.1016/0040-4020(96)00037-3
日期:1996.3
The ketals or enol ethers of 1,5-azidoketones were converted into lactams using a two-stage process. Treatment of the ketals and enol ethers with acid (trifluoroacetic acid, triflic acid, or trimethylsilyl triflate) afforded an oxonium ion which reacted with the tethered azide to give a 1,1-azido-alkoxy intermediate. Bond reorganization led to an iminium ether that was reacted with sodium iodide in
Overcoming Product Inhibition in Catalysis of the Intramolecular Schmidt Reaction
作者:Hashim F. Motiwala、Charlie Fehl、Sze-Wan Li、Erin Hirt、Patrick Porubsky、Jeffrey Aubé
DOI:10.1021/ja402848c
日期:2013.6.19
carrying out the intramolecularSchmidtreaction of alkylazides and ketones using a substoichiometric amount of catalyst is reported. Following extensive screening, the use of the strong hydrogen-bond-donating solvent hexafluoro-2-propanol was found to be consistent with low catalyst loadings, which ranged from 2.5 mol % for favorable substrates to 25 mol % for more difficult cases. Reaction optimization