Synthesis of 3,3-disubstituted α-tetralones by rhodium-catalysed reaction of 1-(2-haloaryl)cyclobutanols
作者:Naoki Ishida、Shota Sawano、Masahiro Murakami
DOI:10.1039/c2cc16907j
日期:——
The rhodium-catalysed reaction of 1-(2-haloaryl)cyclobutanols afforded 3,3-disubstituted α-tetralones. The reaction was applied to the asymmetric synthesis of α-tetralones bearing a chiral quaternary carbon centre at the 3-position, which was otherwise difficult to execute.
Ligand-Accelerated Pd-Catalyzed Ketone γ-Arylation via C–C Cleavage with Aryl Chlorides
作者:Asraa Ziadi、Ruben Martin
DOI:10.1021/ol300119u
日期:2012.3.2
efficient Pd-catalyzed arylative ring expansion of cyclobutanols viaC–Cbondcleavage is presented. The method allows the coupling of aryl chlorides at low catalyst loadings with a wide range of functional groups and substitution patterns, thus constituting a straightforward alternative for preparing rather elusive γ-arylatedketones.
Enantioselective Synthesis of Indanols from tert-Cyclobutanols Using a Rhodium-Catalyzed CC/CH Activation Sequence
作者:Tobias Seiser、Olivia A. Roth、Nicolai Cramer
DOI:10.1002/anie.200903189
日期:——
Activation! An enantioselective activation of tert‐cyclobutanols by a chiral rhodium(I) complex has been developed. The resulting reactive organometallic species lead (presumably by a CHactivation pathway) to aryl rhodium intermediates that provide substituted indanol derivatives in excellent enantio‐ and diastereoselectivities (see scheme).
and medicinal chemistry. However, coupling reactions of cyclobutanols involving β-carbon elimination to construct C(sp3)–C(sp3) bonds have scarcely been developed. Here, we demonstrate a highly enantioselective Pd-catalyzed intermolecular C(sp3)–C(sp3) coupling reaction of a broad range of cyclobutanol derivatives and unactivated alkenes, allowing convenientaccess to a series of chiral benzene-fused
describe the unexpected 2-fold Csp3–Csp3 bond cleavage suffered by cyclobutanols in the presence of a catalytic amount of Pd(OAc)2 and promoted by the bulky biaryl JohnPhos ligand. Overall, the sequential cleavage of a strained and an unstrained Csp3–Csp3 bond leads to the formal [2 + 2]-retrocyclization products, namely, styrene and acetophenone derivatives. This procedure might enable the use of cyclobutanols