Reactions of Alkyl Azides and Ketones as Mediated by Lewis Acids: Schmidt and Mannich Reactions Using Azide Precursors
作者:Pankaj Desai、Klaas Schildknegt、Konstantinos A. Agrios、Craig Mossman、Gregory L. Milligan、Jeffrey Aubé
DOI:10.1021/ja000490v
日期:2000.8.1
variation of the Mannichreaction. The scope of each of these reactions, the dependence of the observed products upon azide and ketone structure, and the nature of acid promotion are discussed. In broad strokes, cyclohexanones and other cyclic ketones react in the presence of TiCl4 to afford insertion products, whereas the Mannich route predominates when benzyl azide and triflic acid are used. The features
We report the first example of palladium‐catalyzed phosphoryl‐carbamoylation of alkene‐tethered carbamoyl chlorides with P(O)H compounds. Both H‐phosphinates and secondary phosphine oxides are compatible with this reaction. DPE‐Phos was used as ligand to facilitate nonbenzylic C(sp3 )−P bonds formations via C(sp3 )−Pd(II)−P reductive elimination. By using this protocol, a range of phosphorylated
Mannich reactions using benzyl azide as a latent N-(phenylamino)methylating agent
作者:Klaas Schildknegt、Konstantinos A. Agrios、Jeffrey Aubé
DOI:10.1016/s0040-4039(98)01721-3
日期:1998.10
tetrachloride effects 1,2-phenyl migration with concomitant liberation of molecular nitrogen. The resulting N-phenyl iminium ion intermediate readily combines with enolizable carbonyl substrates to form Mannich bases.
Benzotriazole-assisted synthesis of novel mannich bases from ketones and diverse aldehydes
作者:Alan R. Katritzky、Philip A. Harris
DOI:10.1016/s0040-4020(01)81378-8
日期:1990.1
β-amino ketones are prepared in moderate to good yields by the reaction of the lithiumenolates of cyclohexanone, acetophenone, α-tetralone and camphor with the readily available adducts from an aldehyde or ketone, an amine and benzotriazole. Some diastereoselectivity is observed when the benzotriazole adduct is derivedfrom benzaldehyde.
Synthesis of substituted γ-lactam via Pd(0)-catalyzed cyclization of alkene-tethered carbamoyl chloride
作者:Chen Chen、Jian Hu、Jianhua Su、Xiaofeng Tong
DOI:10.1016/j.tetlet.2014.04.019
日期:2014.5
Pd(0)-catalyzed carboiodonation of but-3-enylcarbamic chloride has been developed with NaI as additive, which provides a ready access to substituted gamma-lactam bearing an alkyl iodide group. This reaction features alkyl iodide reductive elimination as a key step in catalytic cycle, indicating the crucial role of additive NaI. (C) 2014 Elsevier Ltd. All rights reserved.