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Hwang, Chang-Ho,Park, Jung-Sup,Won, Jeong-Hee,Kim, Jae-Nyoung,Ryu, Eung K. The Pharmaceutical Society of Korea 1992 Archives of Pharmacal Research Vol.15 No.1
Pyrimidine bases and their mucleosides were oxidatively iodinated at C-5 position by the reaction of iodine in DMF (dimethylformamide) with MCPBA (m-chloroperbenzoic acid) under mild conditions. For uracil derivatives such as uracil 1a. 1, 3-dimethyluracil 1b, uridine 1c, and 2'-deoxyuridine 1d, the corresponding 5-iodo derivatives were obtained in high yields (71-95%). The iodination of cytidine 3a and 2'-deoxycytidine 3b was achieved in moderate yields (41-56%).
Utekar, Druman R.,Saman, Shriniwas D. Korean Chemical Society 2014 대한화학회지 Vol.58 No.2
Dibenzo-18-crown-6, dibenzo-21-crown-7 and dihydroxy dibenzo-18-crown-6 were synthesized by Bayer-Villiger oxidation strategy. Dibenzo-18-crown-6 and dibenzo-21-crown-7 could be synthesized through a three-step protocol starting from salicylaldehyde. Salicylaldehyde was reacted with bis-(2-chloroethyl)ether using $K_2CO_3$ in acetonitrile to link the two phenolic groups with the oxyethylene bridge followed by conversion of the formyl group to the hydroxy group via a Baeyer-Villiger reaction and finally linking the two phenolic group with appropriate oxyethylene bridge. The two target crown ethers were obtained in overall yield, 24% and 30%, respectively. This method has a great potential for synthesis of symmetrical as well as unsymmetrical dibenzo crowns with varying oxyethylene bridges. Baeyer-Villiger oxidation could be used to prepare dihydroxy derivative of dibenzo-18-crown-6 through acetylation of dibenzo-18-crown-6 followed by Baeyer-Villiger oxidation. The Baeyer-Villiger oxidation could be substantially accelerated using trifluoroacetic acid.
김신규(Sin Kyu Kim),김동현(Dong Hyun Kim),정경희(Kyung Hee Chung),황순호(Soon Ho Hwang),김재현(Jae Hyun Kim) 대한약학회 1994 약학회지 Vol.38 No.1
Irradiation of the berberinephenolbetaine [1] effected valence tautamerization to give 8,14-cycloberbine[2], which was converted to the spirobenzylisoquinolines by regioselective C-N bond cleavage A variety of ring systems such as compounds [4], [5] and [6] were indroduced by the structural modification of berberinephenolbetaine.