Lewis acid catalysis in a supercritical carbon dioxide (scCO2)-poly(ethylene glycol) derivatives (PEGs) system: remarkable effect of PEGS as additives on reactivity of Ln(OTf)3-catalyzed Mannich and aldol reactions in scCO2
作者:Ichiro Komoto、Shū Kobayashi
DOI:10.1039/b106437c
日期:——
Use of poly(ethylene glycol) derivatives (PEGs) as additives
in supercritical carbon dioxide (scCO2) was found to be
effective for Mannich and aldol reactions of silyl enolates with aldehydes
and imines, and formation of emulsions was observed in these systems.
Study on the “Tin-Ene” reaction of α-bromoacetophenone and metallic tin with aldehydes
作者:Jing-Yao Zhou、Yu Jia、Qiu-Yi Shao、Shi-Hui Wu
DOI:10.1080/00397919608086752
日期:1996.2
Abstract β-hydroxy ketones were obtained in good yields by the “tin-ene” reactions of α-bromoacetophenone and metallic tin with aldehydes.
摘要 通过 α-溴苯乙酮和金属锡与醛的“锡-烯”反应,以良好的收率获得了 β-羟基酮。
Strong Lewis acid air-stable cationic titanocene perfluoroalkyl(aryl)sulfonate complexes as highly efficient and recyclable catalysts for C–C bond forming reactions
A series of titanocene perfluoroalkyl(aryl)sulfonate complexes were synthesized, characterized, and applied in various C–C bond forming reactions.
一系列的钛ocene基过氟烷基(芳基)磺酸盐配合物被合成、表征,并应用于各种C-C键形成反应。
Development of N,N-bis(perfluoroalkanesulfonyl)squaramides as new strong Brønsted acids and their application to organic reactions
作者:Cheol Hong Cheon、Hisashi Yamamoto
DOI:10.1016/j.tet.2010.03.120
日期:2010.6
l groups have been developed and applied to several organic reactions. These squaramides are bench-stable and exhibit much higher reactivities in several organic reactions than squaric acid itself. N,N-Bis(trifluoromethanesulfonyl)squaramide 2a was applied to the Mukaiyama aldol reaction and Mukaiyama Michael reaction. Mechanistic studies revealed that the Brønsted acid might be the predominant catalyst
P(PhCH<sub>2</sub>NCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N Catalysis of Mukaiyama Aldol Reactions of Aliphatic, Aromatic, and Heterocyclic Aldehydes and Trifluoromethyl Phenyl Ketone
作者:Venkat Reddy Chintareddy、Kuldeep Wadhwa、John G. Verkade
DOI:10.1021/jo901571y
日期:2009.11.6
2-(trimethylsilyloxy)furan underwent clean conversion to β-hydroxy carbonyl compounds under our reaction conditions. In the case of bulky (2,2-dimethyl-1-methylenepropoxy)trimethylsilane, only α,β-unsaturatedesters were isolated. Heterocyclic aldehydes, such as pyridine-2-carboxaldehyde, benzofuran-2-carboxaldehyde, benzothiophene-2-carboxaldehyde, and 1-methyl-2-imidazolecarboxaldehyde, gave good yields of Mukaiyama