Comparison of vinyl organolithium and organopalladium reagents for intramolecular conjugate addition to vinyl sulfones.
作者:Sang Who Lee、P.L. Fuchs
DOI:10.1016/s0040-4039(00)73954-2
日期:1993.8
Synthesis of cis-fused bicyclic ethers (5-10) by intramolecular conjugateaddition of vinyl lithium and organopalladium reagents to cyclohexenyl/pentenyl moiety of vinylsulfones is described.
Convergent Assembly of the Tricyclic Labdane Core Enables Synthesis of Diverse Forskolin‐like Molecules
作者:Paweł M. Szczepanik、Andrey A. Mikhaylov、Ondřej Hylse、Roman Kučera、Petra Daďová、Marek Nečas、Lukáš Kubala、Kamil Paruch、Jakub Švenda
DOI:10.1002/anie.202213183
日期:2023.1.2
large family of bioactive naturalproducts. Their often-complex structures present challenges to semisynthesis and denovo chemical synthesis in search of analogs with improved properties. To enable new modifications of the well-known tricyclic terpene forskolin, we have developed a distinct and potentially general synthetic scheme for the preparation of analogs of complex labdanes.
作者:Krastina V. Petrova、Justin T. Mohr、Brian M. Stoltz
DOI:10.1021/ol802410t
日期:2009.1.15
An enantioselective total synthesis of (+)-cassiol is reported. The complex derived from Pd-2(pmdba)(3) and enantiopure t-BuPHOX ligand catalyzes enantioconvergent decarboxylative alkylation to generate the quaternary carbon stereocenter at an early stage. The overall synthetic strategy involves a convergent late-stage coupling of two fragments. The synthesis features a longest linear sequence of eight steps.
Controlled endocyclic and exocyclic γ-metalations of β-substituted cyclohexenyl sulfones. Regiospecific syntheses of γ-oxygenated cyclohexenyl sulfones.
作者:S.W Lee、P.L Fuchs
DOI:10.1016/0040-4039(91)80632-g
日期:1991.6
Beta-Substituted cyclohexenyl sulfones may be regiospecifically isomerized to either endocyclic or exocyclic allyl sulfones. Epoxidation of these materials followed by a second metalation yields gamma-hydroxy cyclohexenyl sulfones 6 and 7. Subjection of either of these materials to a second oxidation/isomerization sequence smoothly provides the bis gamma-hydroxylated cyclohexenyl sulfone 10 in excellent overall yield.
Synthesis of Heterocycles Utilizing N2-TiCl4-Li-TMSCl