Enantiomerically pure α-methoxyaryl acetaldehydes as versatile precursors: a facile chemo-enzymatic methodology for their preparation
摘要:
A facile and efficient synthesis of optically active alpha-methoxyaryl acetic acids (up to 95% ee), alpha-methoxyaryl ethanols (up to 93% ee) and alpha-methoxyaryl acetonitriles (up to 93% ee) was achieved via Arthrobacter sp. lipase-catalyzed kinetic resolution of masked aldehydes as the key synthons, that is, alpha-hydroxyaryl acetaldehyde acetals. (C) 2008 Elsevier Ltd. All rights reserved.
Gold-catalyzed oxidative cleavage of aryl-substituted alkynyl ethers using molecular oxygen. Simultaneous degradation of C–H and single and triple carbon–carbon bonds under ambient conditions
作者:Arindam Das、Rupsha Chaudhuri、Rai-Shung Liu
DOI:10.1039/b908338c
日期:——
We report the gold-catalyzed oxidativecleavage of aryl-substituted alkynyl ethers using molecular oxygen under ambient conditions; the transformation involves a remarkable cleavage of C-H, C-C and C[triple bond, length as m-dash]C bonds simultaneously.
The effect of electrolysis conditions on the oxidation of styrene in methanol
作者:Yu. N. Ogibin、A. I. Ilovaiskii、G. I. Nikishin
DOI:10.1007/bf00697143
日期:1994.9
effect of the anion of the supporting electrolyte and of the anode material on this process have been studied. The most efficient conversion of1 into (1,2-dimethoxyethyl)benzene (2) occurs when the electrolysis is carried out with a platinum anode and with potassium fluoride or tetrabutylammonium tetrafluoroborate as the supporting electrolyte. Cleavage of the C-C σ bond in2 to give benzaldehyde dimethylacetal
Anodic oxidation of styrene in methanol was performed in an electrolyzer with gas-lift. The possibility of carrying this process out in continuous mode with the use of technical-grade methanol was studied.
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作者:I. B. Il'chibaeva、E. Sh. Kagan、A. P. Tomilov
DOI:10.1023/a:1013812321096
日期:——
Electrochemical methoxylation of cinnamic acid is accompanied by decarboxylation and yields 1,1,2-trimethoxy-2-phenylethane through formation of gamma-truxillic acid in the initial stage. Under the same conditions methyl cinnamate and cinnamamide give rise to hydrodimerization and reduction products. The results show that introduction of electron-acceptor substituents into the beta-position of the aliphatic chain of styrene hinders methoxylation.
TIECCO, MARCELLO;TESTAFERRI, LORENZO;TINGOLI, MARCO;CHIANELLI, DONATELLA;+, TETRAHEDRON, 44,(1988) N 8, C. 2273-2282