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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 21, Number 9
BKCSDE 21(9)
September 20, 2000 

Beckmann Rearrangements of 1-Imdanone Oxime Derivatives Using Aluminum Chloride and Mechanistic Consider-ations
Byoung Se Lee, Soyoung Chu, In Young Lee,Bon-Su Lee,* Choong Eui Song, Dae Yoon Chi*
Hydrocarbostyril, which is a key intermediate in our new synthetic route to 6-nitroquipazine, can be prepared from 1-indanone oxime by Beckmann rearrangement. We have optimized the reaction by using a Lewis acid, aluminum chloride,in the yield of 91% instead of common acids such as polyphosphoric acid,and sulfuric acid used in conventional Beckmann rearrangement (20% in the literature, 10% in our experiment).The optimized condition is established by usingthree equivalents of aluminum chloride in CH2Cl2 at -40 ℃ - room tempera-turefor 40 min. We have applied this condition to other 1-indanone derivatives, such as 4-methyl-, 4-methoxy-, 4-nitro and 6-nitro-1-indanones. The mechanism ofthis BR has been proposed on the basis of the effect of tem-perature and substituenton product ratio, with the aid of PM3 calculation for a model system.
860 - 866
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