Pd-Catalyzed Semmler–Wolff Reactions for the Conversion of Substituted Cyclohexenone Oximes to Primary Anilines
摘要:
Homogeneous Pd catalysts have been identified for the conversion of cyclohexenone and tetralone O-pivaloyl oximes to the corresponding primary anilines and 1-aminonaphthalenes. This method is inspired by the Semmler-Wolff reaction, a classic method that exhibits limited synthetic utility owing to its forcing conditions, narrow scope, and low product yields. The oxime N-O bond undergoes oxidative addition to Pd-0(PCy3)(2), and the product of this step has been characterized by X-ray crystallography and shown to undergo dehydrogenation to afford the aniline product.
Regiodivergent Halogenation of Vinylogous Esters: One-Pot, Transition-Metal-Free Access to Differentiated Haloresorcinols
作者:Xiaohong Chen、Jenny S. Martinez、Justin T. Mohr
DOI:10.1021/ol503561x
日期:2015.1.16
vinylogous esters and sulfonyl halide halogen donors. Either the 4- or 6-haloresorcinol isomer is accessible from a common precursor. In contrast to conventional oxidants for arene halogenation, mild sulfonyl halides allow broad functional group compatibility. The strategy inherently differentiates the two resorcinol oxygen atoms and enhances the potential for complexmolecule synthesis.
Practical regioselective halogenation of vinylogous esters: synthesis of differentiated mono-haloresorcinols and polyhalogenated resorcinols
作者:Xiaohong Chen、Xiaoguang Liu、Jenny S. Martinez、Justin T. Mohr
DOI:10.1016/j.tet.2016.02.006
日期:2016.6
A practical and efficient method for the direct, regioselective conversion of vinylogousesters to haloresorcinols is reported. Control of the reaction conditions enables synthesis of either the 4- or 6-haloresorcinol isomers from a common precursor with excellent regiocontrol and high yield. The generality and functional group tolerance of this novel protocol is demonstrated. The utility of this methodology
Enzyme- and Ruthenium-Catalyzed Dynamic Kinetic Resolution of Functionalized Cyclic Allylic Alcohols
作者:Richard Lihammar、Renaud Millet、Jan-E. Bäckvall
DOI:10.1021/jo402086z
日期:2013.12.6
Enantioselective synthesis of functionalized cyclic allylic alcohols viadynamic kinetic resolution has been developed. Cyclopentadienylruthenium catalysts were used for the racemization, and lipase PS-IM or CALB was employed for the resolution. By optimization of the reaction conditions the formation of the enone byproduct was minimized, making it possible to prepare a range of optically active functionalized
Notiz über die Verwendung von 3-(Arylsulfonyl)-2-cycloalkenonen als 2-Cycloalkinon-Synthese-Equivalente
作者:Frank Kienzle、Rudolf E. Minder
DOI:10.1002/hlca.19870700611
日期:1987.9.23
Note on the Use of 3-(Arylsulfonyl)-2-cycloalkenones as Synthesis Equivalents of 2-Cycloalkynones
关于使用3-(芳磺酰基)-2-环烯酮作为2-环炔基的合成当量的说明
Reagent design and study of allene as a promising class of reagents (synthons) for cycloaddition. The site-selective and regioselective Diels-Alder reactions of (phenylsulfonyl)propadiene and alkylation of the adducts