Tandem Cross‐Coupling/Spirocyclization/Mannich‐Type Reactions of 3‐(2‐Isocyanoethyl)indoles with Diazo Compounds toward Polycyclic Spiroindolines
作者:Guo‐Shu Chen、Shu‐Jie Chen、Jian Luo、Xiang‐Yu Mao、Albert Sun‐Chi Chan、Raymond Wai‐Yin Sun、Yun‐Lin Liu
DOI:10.1002/anie.201911614
日期:2020.1.7
and subsequent spirocyclization/Mannich-type reaction have been developed to assemble polycyclic spiroindoline skeletons. Formation of spiroindolenines has been proven as the crucial step for the following Mannich-type cyclization reaction. Accordingly, a novel approach on chiral phosphoric acid catalyzed Mannich-type cyclization toward the formation of diastereomerically and enantiomerically enriched
Formation of 2-Methylene-1,3-oxathiole Derivatives in the Rhodium(II) Acetate-Catalyzed Reaction of α -Diazocarbonyl Compounds with Carbon Disulfide
作者:Hirofumi Nakano、Toshikazu Ibata
DOI:10.1080/10426500902856313
日期:2009.5.14
The rhodium(II) acetate-catalyzedreaction of α -diazocarbonyl compound with carbon disulfide gave 1,3-oxathiole-2-thione, 2-methylene-1,3-oxathiole, and 2,2′ -spirobis(1,3-oxathiole) derivatives depending on the substituent on the diazo compounds via 1,5- or 1,3-electrocyclization of thiocarbonyl ylide intermediate formed by the reaction of rhodium carbenoid with thiocarbonyl group.
Efficient palladium-catalyzed cross-coupling reactions of α-diazocarbonyl compounds and arylboronic acids or arylhalides have been developed. The reaction proceeds smoothly for a range of diazo compounds, boronic acids, and halides. The coupling reaction conditions tolerate various substituents on the aromatic rings of the substrates, such as chloro, fluoro, acyl, oxo, ester, and nitro groups. This