Radical addition to carbonyl carbon promoted by aqueous titanium trichloride: stereoselective synthesis of .alpha.,.beta.-dihydroxy ketones
作者:Angelo Clerici、Ombretta Porta
DOI:10.1021/jo00277a025
日期:1989.8
Photocatalytic Ring Opening of α-Epoxyketones: 1,3-Dioxolane Formation
作者:Hamid R. Memarian、Farzad Nikpour
DOI:10.1007/s007060200073
日期:2002.7
Photocatalytic ring opening of alpha-epoxyketones by 2,4,6-triphenylpyrylium tetrafluoroborate in acetone resulted in the formation of 1,3-dioxolanes as major products through C-O bond cleavage and the formation of alcoholic by-products through C-C bond cleavage. The type and nature of the substituent affects the rate of ring opening.
CLERICI, ANGELO;PORTA, OMBRETTA, J. ORG. CHEM., 54,(1989) N6, C. 3872-3878
作者:CLERICI, ANGELO、PORTA, OMBRETTA
DOI:——
日期:——
Studies on Pyrimidine Derivatives and Related Compounds. LIV. Reactions of Thiamine with α-Ketoaldehydes
作者:AKIRA TAKAMIZAWA、SAICHI MATSUMOTO、SHOJI SAKAI
DOI:10.1248/cpb.17.128
日期:——
Reaction of thiamine-sodium salt (III) with phenylglyoxal in the presence of carbon dioxide yielded 2-phenyloxalylthiamine (Va) which underwent facile air oxidation to thiamine thiazolone (VI) and phenylglyoxylic acid. Thiamine hydrochloride (I) was also condensed with phenylglyoxal in the presence of triethylamine or sodium hydroxide to give Va. The reaction was applied to a number of α-ketoaldehydes including some heterocyclic glyoxals to give corresponding 2-oxalylthiamine derivatives (Vb-1) which were shown to be convertible into stable acyl derivatives (XIa-r).