59276-37-8Relevant articles and documents
Tropylium salts as efficient organic Lewis acid catalysts for acetalization and transacetalization reactions in batch and flow
Lyons,Crocker,Enders,Nguyen
supporting information, p. 3993 - 3996 (2017/09/08)
Acetalization reactions play significant roles in the synthetically important masking chemistry of carbonyl compounds. Herein we demonstrate for the first time that tropylium salts can act as organic Lewis acid catalysts to facilitate acetalization and transacetalization reactions of a wide range of aldehyde substrates. This metal-free method works efficiently in both batch and flow conditions, prompting further future applications of tropylium organocatalysts in green synthesis.
Diterpenoid alkaloid lappaconine derivative catalyzed asymmetric α-hydroxylation of β-dicarbonyl compounds with hydrogen peroxide
Li, Zhi,Lian, Mingming,Yang, Fan,Meng, Qingwei,Gao, Zhanxian
supporting information, p. 3491 - 3495 (2014/06/09)
A new framework derived from the commercially available diterpenoid alkaloid lappaconitine was evaluated as a Bronsted base catalyst for the enantioselective α-hydroxylation of β-dicarbonyl compounds by using 30% hydrogen peroxide as a green and highly practical source of oxygen. This protocol allows convenient access to the corresponding α-hydroxy-β- oxo esters, α-hydroxy-β-oxo amides and (-)-kjellmanianone with up to 98% yield and 92% ee. Copyright
New two-step sequence involving a hetero-Diels-Alder and a nonphenolic oxidative coupling reaction: A convergent access to analogs of steganacin
Laurent, Mathieu Y.,Stocker, Vivien,Temgoua, Valéry Momo,Dujardin, Gilles,Dhal, Robert
supporting information; experimental part, p. 1608 - 1611 (2011/04/26)
A new family of analogs of steganacin, an important antimitotic compound, was accessed. It takes advantage of a completely stereoselective sequence of two key steps. The central dihydropyrane core is built by a highly diastereoselective and facially controlled hetero-Diels-Alder reaction. It is followed by a nonphenolic biaryl oxidative coupling with a complete atropo-stereoselectivity. It leads to a quick way to form cyclic biaryl lignans.