The Chiral Diamine Mediated Asymmetric Baylis–Hillman Reaction
作者:Yujiro Hayashi、Tomohiro Tamura、Mitsuru Shoji
DOI:10.1002/adsc.200404069
日期:2004.8
A chiral diamine, easily prepared from proline, is an effective, asymmetric organic catalyst for the Baylis–Hillmanreaction of aldehydes and methyl vinyl ketone, affording adducts with enantioselectivities up to 75%.
Asymmetric Morita–Baylis–Hillman reactions of 2-cyclohexen-1-one catalyzed by chiral biaryl-based bis(thiourea) organocatalysts
作者:Yuki Nakayama、Takashi Gotanda、Katsuji Ito
DOI:10.1016/j.tetlet.2011.09.064
日期:2011.11
Newly-developed bis(thiourea) 1d was found to be an efficient organocatalyst for the Morita-Baylis-Hillman reaction. High enantioselectivities were obtained in the reaction of 2-cyclohexen-1-one with both aromatic aldehydes (up to 84% ee) and aliphatic aldehydes (up to 96% ee). (C) 2011 Elsevier Ltd. All rights reserved.
Methods for the synthesis of chiral sulfur heterocycles and their application in the asymmetric Baylis–Hillman reactions
作者:Mariappan Periasamy、Ramani Gurubrahamam、Gopal P. Muthukumaragopal
DOI:10.1016/j.tetasy.2013.03.021
日期:2013.5
Enantiomerically pure (2S,6S)-2,6-diphenyltetrahydro-2H-thiopyran, (2S)-2-phenyltetrahydro thiophene, and (2S)-2-phenyltetrahydro-2H-thiopyran were prepared in 70-72% yields and with 86-99% ee via cyclization of the corresponding dimesylate in an S(N)2 cyclization reaction using sodium sulfide nonahydrate. The results on the application of various chiral sulfides in asymmetric Baylis-Hillman reactions are also described. (C) 2013 Elsevier Ltd. All rights reserved.
10.24820/ark.5550190.p011.072dummy2
作者:Aydin, A. Ebru
DOI:10.24820/ark.5550190.p011.072dummy2
日期:——
Chiral thiourea derivatives as organocatalyts in the enantioselective Morita-Baylis-Hillman reactions
作者:A. Ebru Aydin
DOI:10.24820/ark.5550190.p011.072
日期:——
Novel chiral bifunctional thiourea derivatives have been synthesised and successfully applied to the intermolecular Morita-Baylis-Hillman (MBH) reaction of an aromatic aldehyde with methyl vinyl ketone (MVK) and to the intramolecular MBH reaction of omega-formyl-enone. The corresponding products were obtained with high enantioselectivities (up to 98 % ee). The thiourea organocatalyst derived from a B-amino alcohol gave high enantioselectivities (92 % ee) in the intermolecular MBH reaction, whereas the same chiral ligand afforded the corresponding product in high yield (85 %) with moderate enantioselectivity (75 % ee) in the intramolecular MBH reaction. The use of a thiophene ring-containing thiourea derivative gave high enantioselectivities in the intermolecular and intramolecular MBH reactions (85 % and 95 % ee, respectively).[GRAPHICS].