access S-heterocycles and mixed N,S-heterocycles via metal-mediated dominoreactions are described. One involves a cyclocarbopalladation/cross-coupling domino process and leads to benzene-fused five- or six-membered sulfur heterocycles with a stereo defined tetrasubstituted exocyclic double bond. The other consists in a three-component dominoreaction between 2-aminophenyl disulfide, copper cyanide
stereodefined tetrasubstituted exocyclic double bond. To illustrate the application of this method to the synthesis of bioactive molecules, a sulfur analogue of the anticancer agent tamoxifen was prepared as a potential selective estrogen-receptor modulator.
propargyl or an alkynyl moiety have been studied in cyclocarbopalladation/cross-coupling domino palladium-catalyzed sequences. The reactivity of different types of sulfured starting materials has been compared as well as the difference in behavior of these compounds depending on the type of cross coupling ending the domino sequence. It appeared that these cascades were constantly more efficient on the propargyl
Gold(I)‐Catalyzed Carbothiolation via Rearrangement of S‐Propargyl Group: An Access to 3‐Allenyl or 3‐Indenyl Benzo[
<i>b</i>
]thiophenes
作者:Camille Van Wesemael、Nicolas Brach、Mihaela Gulea、Gaëlle Blond
DOI:10.1002/adsc.202201000
日期:2022.12.8
A series of 3-allenyl benzo[b]thiophenes were synthesized through a gold(I)-catalyzed domino reaction. The process consists in a 5-endo-dig cyclization with C−S bond formation and consecutive S-to-C propargyl migration via [3,3]-sigmatropic Claisen rearrangement. With aryl substituents on both triple bonds of the substrate, subsequent intramolecular hydroarylation on the formed allenyl system led to