process based on reversible nucleophilic addition and intramolecular lactonization of methyl 2-formylbenzoate leads to the efficient synthesis of 3-functionalized phthalides, which are important precursors for the synthesis of quinone skeletons via Hauser–Kraus annulation. The reactions are successfully carried out under mild conditions in single operations.
TiCl4-Mediated Synthesis of 3,4-Hetero-Disubstituted Isocoumarins by Means of Isocyanide Insertion Reactions
作者:Laurent El Kaïm、Laurence Grimaud、Maxime Vitale、Sudipta Ponra、Aude Nyadanu、Sylvie Maurin
DOI:10.1055/s-0036-1591733
日期:2018.3
Abstract The isocyanideinsertion into sulfanyl-phthalides under Lewis acid conditions is reported with full details. This sequential three-component reaction affords a new straightforward and highly convenient method for the preparation of 3-amino-4-sulfanyl isocoumarins, the potential of which is still unexplored. The isocyanideinsertion into sulfanyl-phthalides under Lewis acid conditions is reported