1256245-86-9Relevant academic research and scientific papers
Catalytic asymmetric cycloetherification via intramolecular oxy-Michael addition of enols
Murata, Ryuichi,Asano, Keisuke,Matsubara, Seijiro
supporting information, (2021/08/26)
Carbonyl compounds employed as carbon nucleophiles have played a dominant role in synthetic organic chemistry; however, there is very limited use of these compounds as oxygen nucleophiles. In particular, there are only a few reports on the oxy-Michael addition of the enol forms of carbonyl nucleophiles. In this study, we present the asymmetric cycloetherification of enols, which are generated in situ from enone-bearing ketones, using chiral bifunctional organocatalysts bearing amino and squaramide groups. This transformation chemo- and enantioselectively afforded dihydropyran derivatives, which are the core structures of building blocks for synthesizing glycans.
Enantioselective Synthesis of Cyclohexenol Derivatives from ?-Aryl-Substituted Enals via an Organocatalyzed Three-Component Reaction
Majee, Debashis,Jakkampudi, Satish,Arman, Hadi D.,Zhao, John C.-G.
, p. 9166 - 9170 (2019/11/14)
A three-component reaction between ?-aryl-substituted α,β-unsaturated aldehydes and nitroalkenes was realized by using cinchona alkaloid-derived (thio)ureas and squaramides via the dienolate intermediates. This unprecedented 1,3- A nd 1,5-reactivity of dienolates of the ?-aryl-α,β-unsaturated aldehydes led to the formation of cyclohexenol derivatives with four contiguous stereogenic centers and a chiral substituent at C2 with good diastereoselectivities and high ee values. Such reactivities of the dienolates are totally different from those of the corresponding dienamine intermediates.
Highly enantioselective michael addition of nitroalkanes to chalcones using chiral squaramides as hydrogen bonding organocatalysts
Yang, Wen,Du, Da-Ming
supporting information; experimental part, p. 5450 - 5453 (2011/02/22)
A series of squaramide-based organocatalysts were facilely synthesized and applied as hydrogen bonding organocatalysts in the enantioselective Michael addition of nitroalkanes to chalcones. These organocatalysts promoted the Michael addition with low cata
