Cooperative Titanocene and Phosphine Catalysis: Accelerated C–X Activation for the Generation of Reactive Organometallics
作者:Lauren M. Fleury、Andrew D. Kosal、James T. Masters、Brandon L. Ashfeld
DOI:10.1021/jo301726v
日期:2013.1.18
transmetalation approach toward the generation of Grignard and organozinc reagents mediated by a titanocene catalyst. This method enables the metalation of functionalized substrates without loss of functional group compatibility. Allyl zinc reagents and allyl, vinyl, and alkyl Grignard reagents were generated in situ and used in the addition to carbonyl substrates to provide the corresponding carbinols in yields
Divergent synthesis of N-heterocycles by Pd-catalyzed controllable cyclization of vinylethylene carbonates
作者:Yuwen Yang、Weibo Yang
DOI:10.1039/c8cc06945j
日期:——
Here, we report a palladium-catalyzed controllable cyclization of vinyl ethylene carbonates that proceeds through formal migration [2+3] and [5+2] cycloadditions, respectively, under mild conditions.
Aluminum oxide catalyzed isomerization of acylated cycloalkenes
作者:T. Hudlicky、T. Srnak
DOI:10.1016/s0040-4039(01)81902-x
日期:1981.1
homologous series of cyclic olefins and their corresponding 1-methyl derivatives were acylated using acetic anhydride/zinc chloride system. The resulting mixtures were, after appropriate analysis, isomerized quantitatively to the conjugated enones by adsorption on neutral alumina. A detailed, general experimental procedure is given.
An economical process for producing (2- and/or 1-)cyclohexenyl methyl ketones which are intermediates for the synthesis of &agr;- or &bgr;-damascone. In the presence of a catalyst, a 3-cyclohexenyl methyl ketone represented by the following formula (1a):
1
wherein, R
1
, R
2
and R
3
each independently represents a hydrogen atom or a methyl group and at least two of R
1
, R
2
and R
3
are methyl groups, is isomerized.