Fe(OTf)3-mediated synthesis of sulfonyl dihydropyrans
作者:Meng-Yang Chang、Yu-Hsin Chen、Yu-Chieh Cheng
DOI:10.1016/j.tet.2015.12.007
日期:2016.1
Fe(OTf)(3)-mediated one-pot (3+3) cycloaddition of beta-ketosulfones 1 with prenyl alcohol (2) in MeNO2 affords sulfonyl dihydropyrans 5 in good yields via a sequential intermolecular alpha-prenylation followed by intramolecular Friedel Crafts alkylation. The method provides a highly effective condition. (C) 2015 Elsevier Ltd. All rights reserved.
In(OTf)3-mediated synthesis of substituted pyridazines
作者:Meng-Yang Chang、Yi-Ju Lu、Yu-Chieh Cheng
DOI:10.1016/j.tet.2015.07.025
日期:2015.9
In(OTf)(3) (4c)-mediated one-pot (4+2) cyclocondensation of gamma-alkynones 3 with N2H4(aq) in dioxane affords substituted pyridazines 5 in good yields via a sequential desulfonative or dehydrogenative aromatization. The facile transformation proceeds by a facile synthetic sequence starting with an alpha-propargylation of beta-ketosulfones 1 and a cyclocondensation of gamma-alkynones 3 with N2H4(aq). The method provides a mild and efficient condition. Moreover, this route can be enlarged to multigram scale. (C) 2015 Elsevier Ltd. All rights reserved.
Towards a facile synthesis of triarylethanones: palladium-catalyzed arylation of ketone enolates under homogeneous and heterogeneous conditions
The palladium-catalyzed regioselective alpha-monoarylation of deoxybenzoins and alpha,alpha-diarylation of acetophenones provides general, efficient access to 1,2,2-triarylethanones. After a comprehensive search for suitable experimental conditions to optimize such transformations, both reactions are alternatively conducted by means of either commercially available polymer-anchored catalysts or a very simple homogeneous catalytic system, thus avoiding the use of complex ligands. In addition, the synthesis of deoxybenzoins employing polymer-supported fibrous palladium catalysts is reported for the first time, and the excellent catalyst recycling properties suggest applicability to industrial purposes. (C) 2004 Elsevier Ltd. All rights reserved.
ELLIOTT, I. W.;EVANS, S. L.;KENNEDY, L. T.;PARRISH, A. E., ORG. PREP. AND PROCED. INT., 21,(1989) N, C. 368-371
作者:ELLIOTT, I. W.、EVANS, S. L.、KENNEDY, L. T.、PARRISH, A. E.