of α‐methylene‐γ‐lactones through the palladium(II)‐catalyzed lactonization of homoallylic alcohols with alkynamides has been reported. The hydroxyl group in the terminal olefins cooperates with the amide in alkynamides to promote the cyclization by suppressing the β‐H elimination. This process provides a route to construct naturally occurring biologically multifunctional α‐methylene‐γ‐lactones.
FORMYLATED XANTHOCILLIN ANALOGUES AS NEUROPROTECTIVE AGENTS
申请人:NEURON BIOPHARMA, S.A.
公开号:US20150011621A1
公开(公告)日:2015-01-08
Formylated xanthocillin analogs can be used in the treatment of neurodegenerative diseases. The analogs can be prepared synthetically, and at least some of the analogs can be obtained from a microorganism strain of the
Penicillium chrysogenum
species.
To provide α-substituted vinyltin useful for the search for function-developing substances such as pharmaceuticals/agrichemicals and functional materials and for the construction of a compound library.
An α-substituted vinyltin compound represented by the formula (1), a tautomer or salt of the compound or a solvate thereof:
R
2
CH═C(R
3
)Sn(R
1
)
3
(1)
wherein R
1
is a C
1-10
alkyl group, a C
2-14
aryl group or the like, R
2
is a C
2-14
aryl group, a C
2-9
heterocyclyl group, a C
3-10
cycloalkyl group or the like, and R
3
is a carbamoyl group, a thiocarbamoyl group, an isocyanate group, an isothiocyanate group, a formylamino group, a thioformylamino group, an isonitrile group, an urea group, a carbamate group or the like.
Palladium/Copper Bimetallic System-Mediated Cross-Coupling of Alkynes and Alkenes: Two Strategies to Suppress β-H Elimination on Alkyl-Palladium Center
efficient strategies to suppress β‐H elimination during the palladium/copper bimetallic system‐mediated cross‐coupling between alkynamides and alkenes. Remote donor groups with the terminal olefins, such as toluenesulfonamide, phosphate, sulfone, etc., cooperate with the amide of alkynamides and chelate the palladium active center, to promote C(sp3)O bond formation by suppressing the β‐H elimination