Synthesis applications of aza-Cope rearrangements. 12. Applications of cationic aza-Cope rearrangements for alkaloid synthesis. Stereoselective preparation of cis-3a-aryloctahydroindoles and a new short route to Amaryllidaceae alkaloids
作者:Larry E. Overman、Leah T. Mendelson、E. Jon Jacobsen
DOI:10.1021/ja00360a014
日期:1983.10
Synthese d'aryl-3a perhydro indolinones-4(A) a partir d'amino-2 aryl-1' vinyl-1 cyclopentanols; application a la synthese de crinine par l'intermediaire de A avec aryl=benzodioxole-1,3yl-5
合成这些 d'aryl-3a perhydroindolinones-4(A) a partir d'amino-2 aryl-1'vinyl-1 cyclopentanols; 应用 a la 合成 de crinine par l'intermediaire de A avec aryl=benzodioxole-1,3yl-5
Microwave-assisted synthesis of α-hydroxy ketone and α-diketone and pyrazine derivatives from α-halo and α,α′-dibromo ketone
A novel reaction of α-haloketone (α-bromo and α-chloro ketone) with irradiation under microwave gave the corresponding α-hydroxyketone and pyrazine derivative in good yields. In the case of α,α′-dibromo ketone, α-diketone was obtained. This reaction affords a new, clean and convenient synthetic method for α-hydroxyketone, α-diketone, α-chloro ketone and pyrazine derivative.
Acid-promoted reaction of cyclic allylic diols with carbonyl compounds. Stereoselective ring-enlarging tetrahydrofuran annulations
作者:Mark J. Brown、Timothy Harrison、Paul M. Herrinton、Mark H. Hopkins、Kira D. Hutchinson、Larry E. Overman、Pratibha Mishra
DOI:10.1021/ja00014a031
日期:1991.7
high levels of stereocontrol by the title reaction. The scope and limitations of this powerful new method for assembling polycyclic ethers are explored in detail. Conformational analysis of potential oxabicyclo [4.4.0] decanyl, oxabicyclo [4.3.0] nonanyl, and oxabicyclo [4.2.0] octanyl cation intermediates allows the stereochemical outcome of the title reaction to be predicted
An efficient method for selective oxidation of 1,2-diols in water catalyzed by Me2SnCl2
作者:Julius M. William、Masami Kuriyama、Osamu Onomura
DOI:10.1039/c3ra42754d
日期:——
Dimethyltin(IV)dichloride-catalyzed selective oxidation of 1,2-diols in water was achieved using dibromoisocyanuric acid (DBI) or Br2 as oxidants. The catalyst activates the 1,2-diol moiety through the formation of stannylene acetal in addition to enhancing selectivity. Various cyclic and acyclic 1,2-diol substrates have been selectively oxidized affording α-hydroxyketones in good to excellent yields. This method
A visible light-driven, copper-catalyzed aerobic oxidativecleavage of cycloalkanones has been presented. A variety of cycloalkanones with varying ring sizes and various α-substituents reacted well to give the distal keto acids or dicarboxylic acids with moderate to good yields.