In this paper, we discuss our new synthetic approach towards functionalized benzo[d]thiazolyl (BT) sulfones, based on the reunion of alkyl BT sulfones and various electrophiles (e.g. RâCOâX, ROâCOâX, RSâCOâX, TsâXâ¦). All important aspects of this coupling reaction, including relevant and undesirable side reactions, are evaluated by means of calculations and competitive experiments. The scope and limitations of this method are established.
Trisubstituted Highly Activated Benzo[<i>d</i>]thiazol-2-yl-sulfone-Containing Olefins as Building Blocks in Organic Synthesis
作者:Ondřej Kováč、František Zálešák、David J.-Y. D. Bon、Lukas Roiser、Lubomír V. Baar、Mario Waser、Jiří Pospíšil
DOI:10.1021/acs.joc.0c00571
日期:2020.6.5
molecular scaffolds. Synthesis of 1,1-deactivated olefins substituted with a BT-sulfonyl group and a carbonyl or nitrile, respectively, consists of unusual Ti(OPri)4-mediated Knoevenagel-type condensation and proceed in good to excellent yields. Generated olefins can be further transformed in a highly stereoselective manner and in good yields to various polyfunctionalized heterocycles and acyclic molecular