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).
A Schmidt route to 1-azabicyclo[x.y.0]alkanes: a comparison of carbocation stabilizing groups
作者:William H Pearson、Rajesh Walavalkar
DOI:10.1016/s0040-4020(01)00353-2
日期:2001.6
The intramolecular Schmidt reactions of tertiary alkyl, tertiarybenzylic, tertiary propargylic, and tertiary allylic carbocations with tethered azides are reported. Using product analysis and deuterium labeling studies, the role of cation rearrangement prior to Schmidt reaction is reported.
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
A concise synthetic pathway towards 5-substituted indolizidines
作者:Tamás R. Varga、Péter Nemes、Zoltán Mucsi、Pál Scheiber
DOI:10.1016/j.tetlet.2006.12.074
日期:2007.2
The total synthesis of 5-(2′-hydroxyethyl)indolizidine via 5-thioindolizidinone is described. The key step is the transformation of 5-thioindolizidinone via Eschenmoser’s sulfide contraction. The racemic mixture of 5R,9R- and 5S,9S-5-(2′-hydroxyethyl)indolizidine was obtained in seven steps in 17% overall yield from 2-allyl cyclopentanone.
描述了通过5-硫代吲哚并咪唑酮的5-(2'-羟乙基)吲哚唑烷的全合成。关键步骤是通过Eschenmoser的硫化物收缩转化5-thioindolizidinone。从2-烯丙基环戊酮以七个步骤以总收率的17%获得了5 R,9 R-和5 S,9 S -5-(2'-羟乙基)吲哚并咪唑的外消旋混合物。