An effective approach for the construction of the decalin ring skeleton of labdane diterpenoids was developed based on a key biomimetic cationic polyene cycliza
A novel catalytic system, ZnCl2 supported on alumina, was found to be an efficient and readily available medium for the solvent-free Friedel-Crafts acylation re
In ionic liquid [Bmim] [BF4], a series of disubstituted and trisubstituted thiourea derivatives were synthesized from phenyl and butyl isothiocyanate with a var