Nitrosation of m-xylene, anisole, 4-nitrophenyl phenyl ether and toluene in trifluoroacetic acid or in acetic–sulfuric acid mixtures under nitric oxide
Boron Trifluoride-Catalyzed Synthesis of 3-Alkylidene-3<i>H</i>-indole<i>N</i>-Oxides<i>via</i>Tandem Reaction of Propargylic Alcohols and Nitrosobenzenes
An atom‐economical synthesis of 3‐alkylidene‐3H‐indole N‐oxides has been developed via a tandem reaction of propargylic alcohols and nitrosobenzenes in the presence of borontrifluoride etherate (BF3⋅Et2O) as catalyst. This method offers great potential for the synthesis of biologically important 3‐alkylidene‐3H‐indole N‐oxides and related derivatives.
Organocatalytic Asymmetric Annulation between Hydroxymaleimides and Nitrosoarenes: Stereoselective Preparation of Chiral Quaternary <i>N</i>-Hydroxyindolines
highly effective asymmetric annulation of nitrosoarenes with hydroxymaleimides catalyzed by a chiral bifunctional amine squaramide catalyst has been disclosed. A wide range of highly fused chiral N-hydroxyindolines with two consecutive quaternary stereocenters and multifunctional groups were directly and effectively prepared in excellent yields (up to >99%) with complete regioselective cyclization and
已公开了一种由手性双官能胺方酸方胺催化剂催化的亚硝基芳烃与羟基马来酰亚胺的不寻常且高度有效的不对称环化反应。直接和有效地制备了具有两个连续的季位立体中心和多功能基团的各种高度融合的手性N-羟基二氢吲哚,具有良好的收率(高达99%),具有完全的区域选择性环化和出色的立体选择性(高达> 99:1 dr 99%ee)。通过精细地转化为一系列新的手性二氢吲哚,可以很好地证明新反应和目标手性实体的效率和潜力。
NBS/DBU-Promoted One-Pot Three-Component Cycloaddition of Malonic Acid Derivatives, Nitrosoarenes, and Alkenes: Synthesis of Isoxazolidines
A general DBU-mediated one-pot three-component cycloaddition reaction of easily accessible malonicacidderivatives, nitrosoarenes, and alkenes has been successfully established with the aid of NBS to provide direct access to highly functionalized isoxazolidine derivatives with generally good to excellent yields, broad functional group tolerance, and excellent regio- and diastereo-selectivities under
transition metals are necessary in the reaction of in situ generated arynes with nitrosoarenes to give substitutedcarbazoles. Depending on the fluoride source and the solvent, either N‐arylated carbazoles or NH‐carbazoles are obtained (see scheme; DME=dimethoxyethane, OTf=trifluoromethanesulfonate). In these cascades a CC and one or two CN bonds are formed. The reactions are easy to conduct and proceed