Regio- and stereoselective synthesis of 2-cyclopentenones via a hydrogenolysis-terminated Heck cyclization of β-alkylthio dienones
作者:Bangyu Liu、Gang Zheng、Xiaocui Liu、Cong Xu、Jingxin Liu、Mang Wang
DOI:10.1039/c3cc37571d
日期:——
Palladium-catalyzed cyclization of β-alkylthio dienone derivatives affords 2-cyclopentenones in a regio- and stereoselective manner in the presence of silane. CâS activation, intramolecular carbopalladation and hydrogenolysis construct the cascade process.
Synthesis of β-Amino-α,β-unsaturated Ketone Derivatives via Sequential Rhodium-Catalyzed Sulfur Ylide Formation/Rearrangement
作者:Jun He、Zengming Man、Yinping Shi、Chuan-Ying Li
DOI:10.1021/acs.joc.5b00521
日期:2015.5.1
a Rh(II) catalyst and β-(methylthio)-α,β-unsaturated ketones, 1-sulfonyl-1,2,3-triazoles can be converted into functionalized β-amino-α,β-unsaturated ketones via formation of α-imino rhodium carbene/sulfur ylide and subsequent rearrangement. The products decompose to useful 2-methylthiopyrrole derivatives conveniently in high yield.
Regioselective synthesis of 3-(methylthio)phenols by formal [3+3]-cyclocondensations of 3-oxo-bis(methylthio)ketenacetals with 1,3-bis(trimethylsilyloxy)-1,3-butadienes and 1,3-dicarbonyl dianions
The cyclization of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-oxo-bis(methylthio)ketenacetals afforded 3-(methylthio)phenols containing an acyl or ester substituent located at position 2. The cyclization of free 1,3-dicarbonyl dianions with 3-oxo-bis(methylthio)ketenacetals resulted in the formation of regioisomeric products containing an acyl group located at position 6.
Regioselective Synthesis of
Functionalized 3-(Methylthio)phenols by the First Formal [3+3] Cyclocondensations
of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with 1,1-Bis(methylthio)-1-en-3-ones
The [3+3] cyclocondensation of 1,3-bis(silyl enol ethers) with 1,1-bis(methylthio)-1-en-3-ones results in the regioselective formation of 3-(methylthio)phenols. The products represent useful synthetic building blocks, which are not readily available by other methods.
A Facile Route to 5-Alkyl-1,1-bis(methylthio)penta-1,4-dien-3-ones
作者:C. V. Asokan、M. P. Balu、H. Ila、H. Junjappa
DOI:10.1055/s-1988-27690
日期:——
(3-Dimethylamino-2-propenoyl)ketene dithioacetals 3a-c, obtained by condensation of the corresponding acylketene dithioacetals 1a-c with dimethylformamide diethyl acetal, undergo 1,4-additions with alkyl Grignard reagents (RMgX, R = CH3, C2H5, n-C3H7 and i-C3H7) on the enaminone moiety to afford the title compounds 4a-l in good yields.