Subject(s)
Indoles/chemical synthesis , Naphthoquinones/chemical synthesis , Anti-Bacterial Agents/chemical synthesis , Anti-Bacterial Agents/chemistry , Carbamates/chemistry , Catalysis , Coordination Complexes/chemistry , Cyclization , Glycosylation , Indoles/chemistry , Naphthoquinones/chemistry , Polyketides/chemical synthesis , Polyketides/chemistryABSTRACT
The lactonamycin model aglycon 4 was synthesized from the trihalogenated benzene derivative 10. Ethynyltetraol 6 was prepared from 10 via carbon elongations, oxidative demethylation, a cycloaddition reaction with the diene derived from homophthalic anhydride, and dihydroxylation. Final E- and F-ring constructions from 6 were realized via a palladium-catalyzed cyclization-methoxycarbonylation, a stereoselective methanol addition, and lactonization, leading to the production of 4.
Subject(s)
Cyclization , Indoles/chemical synthesis , Indoles/chemistry , Molecular Structure , Naphthoquinones/chemical synthesis , Naphthoquinones/chemistry , StereoisomerismABSTRACT
To understand the physiological process underlying view-invariant object recognition, we designed a delayed matching-to-sample task under two different conditions: in the first condition, the sample and test stimuli were presented in the same view, and in the second, the two stimuli were presented in different views. The event-related potential (ERP) component, posterior N1, exhibited a significantly larger amplitude when the test image was in the same view as the sample image than when the test and the sample images were in different views. The result indicates that the posterior N1 is significantly sensitive to view association, and clarifies the difference between the neuronal activity that occurs in 3D object recognition and 2D image identification at the level of N1.
