The aldolreaction of hydroxyacetone with different aldehydes usingimmobilizedproline on a mesoporoussupport, assisted by heat and microwaves, has been explored. It was found that heterogenized L-proline on MCM-41 catalyzed aldolreactions in both hydrophilic and hydrophobic solvents, and provided stereoselectivities in some cases complementary to the homogeneous catalyst. The heterogeneous catalysts
Pepsin-catalyzed direct asymmetric aldol reactions for the synthesis of vicinal diol compounds
作者:Ling-Yu Li、Da-Cheng Yang、Zhi Guan、Yan-Hong He
DOI:10.1016/j.tet.2015.01.061
日期:2015.3
The catalytic promiscuity of pepsin from porcine gastric mucous was observed in catalysis of the direct asymmetric aldol reactions of aromaticaldehydes with acetones, which were substituted by hydroxy-, dihydroxy-, methoxy- and benzyloxy- for the synthesis of diol compounds in acetonitrile. This biocatalysis was also applicable to the aldol reactions of cyclic or hetereocyclic ketones with aromatic
The tertiary amine-catalyzed direct asymmetricaldolreaction of hydroxyacetone with a variety of aromatic aldehydes is developed. Using 5–10 mol % of quinidine as catalyst, the direct aldol condensation products were obtained in reasonable yields and with asymmetric induction (up to 47% ee). The present approach is extended to asymmetric organocatalytic strategies for the preparation of 1,2-diols
Pattern-Based Recognition for the Rapid Determination of Identity, Concentration, and Enantiomeric Excess of Subtly Different Threo Diols
作者:Shagufta H. Shabbir、Leo A. Joyce、Gabriella M. da Cruz、Vincent M. Lynch、Steven Sorey、Eric V. Anslyn
DOI:10.1021/ja904545d
日期:2009.9.16
pattern-based recognition approach for the rapid determination of the identity, concentration, and enantiomericexcess of chiral vicinal diols, specifically threo diols, has been developed. A diverse enantioselective sensor array was generated using three chiralboronicacid receptors and three pH indicators. The optical response produced by the sensor array was analyzed by two pattern-recognition algorithms:
Insights into Substituent Effects of Benzaldehyde Derivatives in a Heterogeneous Organocatalyzed Aldol Reaction
作者:Graziano Di Carmine、Fabio Pesciaioli、Simeng Wang、Arianna Sinibaldi、Giuliana Giorgianni、Christopher M. A. Parlett、Armando Carlone、Carmine D'Agostino
DOI:10.1002/cctc.202200405
日期:2022.7.21
heterogenous organocatalysis is undoubtedly critical to develop new and higher performing catalysts. NMR relaxation techniques provide very useful insights into adsorption effects of the aldehyde partner in an organocatalyzed aldol reaction.