an effective means to convert methyl 2‐(azidomethyl)‐3‐arylpropenoates and 2‐(azidomethyl)‐3‐arylacrylonitriles to the corresponding iminyl radicals via α‐hydrogenabstraction and subsequent extrusion of dinitrogen. Thus formed iminyl radicals then undergo intramolecular ortho attack on the aryl ring, affording methyl quinoline‐3‐carboxylates and quinoline‐3‐carbonitriles respectively.
Stereoselective Synthesis of (<i>Z</i>)- and (<i>E</i>)-Allyl Aryl Sulfides and Selenides from<i>Baylis</i><i>Hillman</i>Acetates under Neutral Conditions Using<i>β</i>-Cyclodextrin in Water
The first example of the stereoselective synthesis of (Z)‐ and (E)‐allylarylsulfides and selenides from BaylisHillman acetates under neutral conditions in H2O by supramolecular catalysis involving β‐cyclodextrin is reported. β‐Cyclodextrin can be recovered and reused. The reaction is very efficient in providing allylarylsulfides and selenides in good‐to‐excellent yields with clean reaction profiles
Various phenyl and p‐tolyl allyl sulfonederivatives were prepared stereoselectively by reacting BaylisHillman acetates with sodium 4‐R‐benzenesulfinate (R=H, Me) in H2O. The reaction was very efficient in providing the corresponding sulfonederivatives in good to excellent yields (Table).
A Facile Zn-mediated Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-Trisubstituted Alkenes from Baylis–Hillman Adducts in Water and Its Application
A simple and efficient stereoselectivesynthesis of (E)- and (Z)-trisubstituted alkenes has been accomplished by treatment of the acetyl derivatives of the Baylis-Hillmanadducts with Zn in saturated aq. NH 4 Cl solution under reflux. The method has been utilized for the preparation of the two chiral insect pheromones, dominicalure-I and dominicalure-II, of the lesser grain borer Rhyzopertha dominica
TMSOTf-catalyzed isomerization of acetates of the Baylis - Hillman adducts, i.e. methyl 3-acetoxy-3-aryl-2-methylenepropanoates and 3-acetoxy-3-aryl-2-methylenepropanenitriles providing methyl (2E)-2-(acetoxymethyl)-3-arylprop-2-enoates and (2E)-2-(acetoxymethyl)-3-arylprop-2-enenitriles, respectively, is described.