Oxidative 1, 2-aryl migration of alky aryl ketones (2, 5, and 8) to 2-arylalkanoates (3, 6, and 9) was effected by using diacetoxyphenyliodine (1). The migration was successfully applied to the preparation of the antiinflammatory agents ibuprofen (15) and clidanac (17).
Potential Antiinflammatory Agents. II. Synthesis and Structure-Activity Relationships of 6-Chloro-5-cyclohexylindan-1-carboxylic Acid (TAI-284) and Related 5-Substituted Indan-1-carboxylic Acids
6-Chloro-5-cyclohexylindan-1-carboxylic acid (TAI-284) and related 5-substituted indan-1-carboxylic acids were prepared for the evaluation of antiinflammatory action. Among them, TAI-284 showed the most potent activity, comparable to that of indomethacin. The replacement of the cyclohexyl moiety at C-5 by other alkyl groups such as isobutyl or isopropyl, or the removal of the chlorine atom at C-6 resulted in a considerable reduction of the activities. The resolution of TAI-284 was effected with quinine, and it was found that the antiinflammatory activity virtually resided in the dextro isomer, the absolute configuration of which was assigned the sinister series by the optical rotatory dispersion spectrum and X-ray crystarography.
ring-opening carboxylation of styrene carbonates with CO2 to achieve dicarboxylic acids and/or β-hydroxy acids has been developed via the selective cleavage of the C(sp3)–O bond in cyclic carbonates. The product selectivity is probably determined by the stability and reactivity of the key benzylic radical and carbanionintermediate.
通过选择性裂解环状碳酸酯中的 C(sp 3 )–O 键,开发了苯乙烯碳酸酯与 CO 2的电还原开环羧化以获得二羧酸和/或β-羟基酸。产物选择性可能由关键的苄基和碳负离子中间体的稳定性和反应性决定。
TAMURA, YASUMITSU;YAKURA, TAKAYUKI;SHIROUCHI, YOSHIAKI;HARUTA, JUN-ICHI, CHEM. AND PHARM. BULL., 1985, 33, N 3, 1097-1103