An article Rhodium(III)-Catalyzed C-H Activation: A Cascade Approach for the Regioselective Synthesis of Fused Heterocyclic Lactone Scaffolds WOS:000518875700062 published article about BENZOIC-ACIDS; NATURAL-PRODUCTS; FACILE SYNTHESIS; ALPHA-PYRONES; O BOND; ALKYNES; ISOCOUMARINS; ANNULATION; FUNCTIONALIZATION; DERIVATIVES in [Kumar, Anil; Prabhu, Kandikere Ramaiah] Indian Inst Sci, Dept Organ Chem, Bangalore 560012, Karnataka, India in 2020, Cited 44. Product Details of 93-97-0. The Name is Benzoic anhydride. Through research, I have a further understanding and discovery of 93-97-0
A Rh(III)-catalyzed cascade C-H activation; regioselective [4 + 2] oxidative annulation; and lactonization of aromatic acids, anhydrides, and acrylic acid derivatives with 4-hydroxy-2-alkynoates have been disclosed. This strategy leads to fused heterocyclic lactone scaffolds in a single step with moderate functional group tolerance and excellent site selectivity. Besides, in one step, an antipode of the cephalosol intermediate natural product that contains a tricyclic isocoumarin framework has been synthesized.
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Reference:
Isothiazole – Wikipedia,
,Isothiazole – ScienceDirect.com