Asymmetric Morita-Baylis-Hillman Reaction Catalyzed by Simple Amino Alcohol Derived Thioureas
作者:Alessandra Lattanzi
DOI:10.1055/s-2007-984882
日期:——
Thioureas straightforwardly derived from commercially available enantiopure amino alcohols have been found to promote the asymmetric Morita-Baylis-Hillman reaction of 2-cyclohexen-1-one and different aldehydes in the presence of triethylamine under solvent-free conditions. The corresponding allylic alcohols were obtained in good to high yields and up to 88% ee.
Organocatalysis in Conjugate Amine Additions. Synthesis of β-Amino Acid Derivatives
作者:Mukund P. Sibi、Kennosuke Itoh
DOI:10.1021/ja071739c
日期:2007.7.1
Conjugateaddition of O-protected hydroxylamines to pyrazole-derived enoates proceeds with high efficiency and enantioselectivity when chiral thioureas are used as activators. A wide variety of substrates undergo conjugate amine addition providing access to enantioenriched β-aminoacidderivatives. Structural requirements for the optimal thiourea catalyst have been established, and the results suggest
Thiocarbonyl Surrogate via Combination of Sulfur and Chloroform for Thiocarbamide and Oxazolidinethione Construction
作者:Wei Tan、Jianpeng Wei、Xuefeng Jiang
DOI:10.1021/acs.orglett.7b00819
日期:2017.4.21
An efficient and practical thiocarbonyl surrogate via combination of sulfur and chloroform has been developed. A variety of thiocarbamides and oxazolidinethiones have been established, including chiral thiourea catalysts and chiral oxazolidinethione auxiliaries with high selectivity. Meanwhile, pesticides Diafenthiuron (an acaricide), ANTU (a rodenticide), and Chloromethiuron (an insecticide) were
Merging Organocatalysis and Gold Catalysis: Enantioselective Synthesis of Tetracyclic Indole Derivatives through a Sequential Double Friedel-Crafts Type Reaction
作者:Charles C. J. Loh、Jan Badorrek、Gerhard Raabe、Dieter Enders
DOI:10.1002/chem.201102793
日期:2011.11.25
Yet another indole miracle: The sequentialcombination of organocatalysis and gold catalysis on C2,C3‐unsubstituted indoles provides an efficient one‐pot access to tetracyclic indole derivatives in very good yields and excellent enantioselectivities (see scheme). The double Friedel–Crafts type reaction, including a rare 7‐endo‐dig cyclisation, opens a new entry to highly enantioenriched anticancer
Evaluating Thiourea Architecture for Intramolecular [2+2] Photocycloaddition of 4-Alkenylcoumarins
作者:Nandini Vallavoju、Sermadurai Selvakumar、Steffen Jockusch、Manoj Thathamkulam Prabhakaran、Mukund P. Sibi、Jayaraman Sivaguru
DOI:10.1002/adsc.201400677
日期:2014.9.15
The efficiency of [2+2] photocycloadditions of 4‐alkenylcoumarins was evaluated with various thiourea skeletons to develop thiourea‐based catalysts for promoting photochemical reactions. Our results indicate that the excited state chemistry is dependent on the nature of the thiourea catalyst employed to activate the photoactive substrate.