Tetrahedron

Reexamination of Products and the Reaction Mechanism of the Chalcogeno-Baylis–Hillman Reaction: Chalcogenide–TiCl 4-mediated Reactions of Electron-Deficient …

…, S Tsujiyama, T Iwamura, S Watanabe, O Muraoka…

文献索引：Kataoka, Tadashi; Kinoshita, Hironori; Iwama, Tetsuo; Tsujiyama, Shin-Ichiro; Iwamura, Tatsunori; Watanabe, Shin-Ichi; Muraoka, Osamu; Tanabe, Genzoh Tetrahedron, 2000 , vol. 56, # 27 p. 4725 - 4731

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被引用次数: 53

摘要

Reactions of p-nitrobenzaldehyde (4) with methyl vinyl ketone (5) were conducted in the presence of TiCl4 and dimethyl sulfide (3) or selenopyranone 6. When the raw product was purified by column chromatography on silica gel, α-chloromethyl aldol 8 was obtained as a mixture of diastereoisomers 8a and 8b. In contrast, purification of the raw product by preparative TLC on silica gel gave α-methylene aldol 7. The mechanism for the formation ...