169053-18-3Relevant academic research and scientific papers
Synthetic 6-aryl-2-hydroxy-6-ketohexa-2,4-dienoic acid substrates for C-C hydrolase BphD: Investigation of a general base catalytic mechanism
Speare, Damian M.,Fleming, Sarah M.,Beckett, Martin N.,Li, Jian-Jun,Bugg, Timothy D. H.
, p. 2942 - 2950 (2007/10/03)
A chemical synthesis of the 2-hydroxy-6-ketohexa-2,4-dienoic acid intermediates on bacterial meta-cleavage pathways has been established, using a Heck coupling strategy. Coupling of ethyl 3-bromo-2-acetoxyacrylate with 1-aryl vinyl ketals or 1-aryl allylic alcohols proceeded in 70-90% yield. Heck coupling with an alkyl vinyl ketal was also successful, allowing the synthesis of an alkyl-substituted ring fission intermediate. The synthetic ring fission intermediates were used to investigate the enzymatic reaction catalysed by C-C hydrolase BphD from Pseudomonas LB400. A reduced substrate analogue 2,6-dihydroxy-6-phenylhexa-2,4-dienoic acid was processed enzymatically to benzaldehyde by C-C hydrolase BphD, consistent with a catalytic mechanism involving general base-catalysed attack of water to give a gem-diol intermediate, and not consistent with a nucleophilic mechanism. A series of para-substituted 2-hydroxy-6-keto-6-phenylhexa-2,4-dienoic acid substrates were assayed against BphD, and the derived Hammett plot (ρ = -0.71) is consistent with a departing carbanion in the transition state for C-C cleavage.
A convenient synthesis of 2-aryl-2-vinyl-[1,3]-dioxolanes and -dioxanes
Gutzmann,Messinger
, p. 523 - 525 (2007/10/02)
Cyclocondensation of γ-aryl-γ-oxosulfones 1 with 1,2- or 1,3-dioles 2 and 3 leads to 2-aryl-2-sulfonylethyl-[1,3]-dioxolanes 4 and -dioxanes 5, respectively. In the presence of potassium tert-butoxid 4 and 5 eliminate sulfinic acid yielding the title comp
