Catalytic enantioselective oxidation of aromatic hydrocarbons with D4-symmetric chiral ruthenium porphyrin catalysts
摘要:
The [Ru-II(D-4-Por*)(CO)(McOH)] (D-4-H(2)Por*=tetrakis[(1S,4R,5R,SS)-1,2,3,4,5,6,7,8-octahydro-1,4:5,8-dimethanoanthracen-9-yl]porphyrin) complex 1 is an effective catalyst for asymmetric hydroxylation of aromatic hydrocarbons with 2,6-dichloropyridine N-oxide (Cl(2)pyNO) as terminal oxidant. Up to 76% ee was achieved for the catalytic hydroxylation of 4-ethyltoluene, 1,1-diethylindan and benzylcyclopropane. Both electron-donating and -withdrawing substituents were found to accelerate the catalytic oxidation reaction, and a large primary H/D kinetic isotope effect (k(H)/k(D) = 11 at 298 K) was observed for the catalytic ethylbenzene-d(10) oxidation. A mechanism involving rate-limiting hydrogen atom abstraction by reactive oxoruthenium species is postulated. (c) 2005 Elsevier Ltd. All rights reserved.
Novel synthetic route to aryl alkanes from aromatic aldehydes and ketones. Novel geminal dialkylation of the carbonyl group of aromatic aldehydes and ketones
作者:Alain Krief、M. Clarembeau、Ph. Barbeaux
DOI:10.1039/c39860000457
日期:——
Benzyl-lithiums, readily available from benzyl methyl selenides and alkyl-lithiums, are efficiently alkylated; this reaction allows the geminaldialkylation of the carbonylgroups of aromaticaldehydes and ketones and the geminal aryl–alkylation of aliphatic analogues.
KRIEF, A.;CLAREMBEAU, M.;BARBEAUX, PH., J. CHEM. SOC. CHEM. COMMUN., 1986, N 6, 457-458
作者:KRIEF, A.、CLAREMBEAU, M.、BARBEAUX, PH.
DOI:——
日期:——
CLAREMBEAU, M.;KRIEF, A., TETRAHEDRON LETT., 1986, 27, N 15, 1719-1722
作者:CLAREMBEAU, M.、KRIEF, A.
DOI:——
日期:——
Friedel-Crafts chemistry. Part 60. 
Concise constructions of bridged polycycles of indanes, pyrido[3,2,1-jk]carbazoles and pyrido[3,2,1-kl]phenothiazines via Friedel-Crafts ring closures
作者:Ali A. Khalaf、Aboel Magd A. Abdel Wahab、Hassan A. K. Abd El-Aal、Yousra M. Nabil
DOI:10.24820/ark.5550190.p011.971
日期:——
A novel method for the geminal dialkylation of the carbonyl group of aromatic aldehydes and ketones
作者:M. Clarembeau、A. Krief
DOI:10.1016/s0040-4039(00)84356-7
日期:1986.1
The title transformation is efficiently achieved by using the selenium methodology which involves the sequential reductive alkylation of arylselenoacetals and of benzylselenides.