Bifunctional Metal/Base Catalysts (Pt/X) for the Direct Synthesis of MIBK from Acetone
作者:Lisiane V. Mattos、Fábio B. Noronha、José Luiz F. Monteiro
DOI:10.1006/jcat.2002.3625
日期:2002.7
The synthesis of MIBK was studied over Pt supported on NaX and CsX zeolites. The activity increased as both the temperature and the H2/Ac ratio were increased. Temperature had also a beneficial effect on the selectivity to MIBK but the H2/Ac ratio had an opposite effect. Activities and selectivities were always higher for Pt/NaX than for Pt/CsX. For Pt/NaX, increasing the reduction temperature increased
an allylic alcohol that is the key to a tetraene was carried out using a packed-bed reactor charged by an acid–silica catalyst (HO-SAS) and flow hydrogenation using molecular hydrogen via a Pd/C catalyst followed. The present work relies on the additional propensity of Pd/C to serve as an acid catalyst, which allows us to perform a flow synthesis of pristane from the aforementioned key allylic alcohol
Enantioselective C−C Bond Formation by Rhodium-Catalyzed Tandem Ylide Formation/[2,3]-Sigmatropic Rearrangement between Donor/Acceptor Carbenoids and Allylic Alcohols
作者:Zhanjie Li、Huw M. L. Davies
DOI:10.1021/ja9075293
日期:2010.1.13
The rhodium-catalyzed reaction of racemic allyl alcohols with methyl phenyldiazoacetate or methyl styryldiazoacetate results in a two-step process, an initial oxonium ylide formation followed by a [2,3]-sigmatropic rearrangement. This process competes favorably with the more conventional O-H insertion chemistry as long as donor/acceptor carbenoids and highly substituted allyl alcohols are used as substrates
Singlet oxygen addition to chiral allylic alcohols and subsequent peroxyacetalization with β-naphthaldehyde: synthesis of diastereomerically pure 3-β-naphthyl-substituted 1,2,4-trioxanes
作者:Axel G. Griesbeck、Tamer T. El-Idreesy、Johann Lex
DOI:10.1016/j.tet.2006.05.093
日期:2006.11
The synthesis of a series of eight β-naphthyl-substituted 1,2,4-trioxanes 3a–h by a sequence of singlet oxygen ene reaction of allylic alcohols 1a–h and Lewis acid catalyzed peroxyacetalization of the allylic hydroperoxides 2a–h with β-naphthaldehyde is reported. The ene reactions were performed by solid-state photooxygenation in dye-crosslinked polystyrene beads and resulted in mixtures of diastereoisomeric
cyclohexane-1,4-dione with allylichydroperoxides 2a-d, bearing an additional hydroxy group in the homoallylic position, by diastereoselective photooxygenation of allylic alcohols 1a-d and subsequent BF3-catalyzed peroxyacetalization with the diketone. From the reaction of a monoprotected cyclohexane-1,4-dione 5 with the allylichydroperoxide 6 derived from the singletoxygenation of methyl hydroxytiglate