Cascade Michael−Aldol Reactions Promoted by Hydrogen Bonding Mediated Catalysis
作者:Liansuo Zu、Jian Wang、Hao Li、Hexin Xie、Wei Jiang、Wei Wang
DOI:10.1021/ja067781+
日期:2007.2.1
diastereoselective tandem Michael−aldol reactions, efficiently catalyzed by a cinchona alkaloid thiourea via synergistic noncovalent hydrogen-bonding activation of both the Michael donor and acceptor, have been developed. The process affords a powerful means for the construction of versatile chiral thiochromanes with the formation of three stereogenic centers in a one-potsynthesis from simple achiral
Synthesis and stereochemical nonrigidity of isomeric Zn(ii)bis-[N-isopropyloxy(mercapto)naphthaldiminates]
作者:V. I. Minkin、M. S. Korobov、R. Ya. Olekhnovich、G. S. Borodkin、L. E. Nivorozhkin
DOI:10.1007/bf00696725
日期:1995.11
Kinetics and reaction mechanisms governing inversion of the tetrahedral configuration at the metal center in the series ofbis-chelate Zn(II) complexes of 3,2-, 1,2-, and 2,1-oxy(mercapto)naphthaldimines, respectively4–6, have been studied with the use of dynamic1H NMR spectroscopy. A polytopal rearrangement of the diagonal twist type has been found to be an energetically preferable pathway of the inversion
Dipeptidylpeptidase 4 (DPP‐4) is a clinically validated target for the treatment of type 2 diabetes mellitus (T2DM). To discover novel and potent DPP‐4 inhibitors, three series of compounds were designed and synthesized in this study based on our previously identified novel scaffold of 2‐phenyl‐3,4‐dihydro‐2H‐benzo[f]chromen‐3‐amine. Among the designed compounds, 41d‐1 was the most potent one with
Chiral Amine Thiourea-Promoted Enantioselective Domino Michael-Aldol Reactions between 2-Mercaptobenzaldehydes and Maleimides
作者:Liansuo Zu、Hexin Xie、Hao Li、Jian Wang、Wei Jiang、Wei Wang
DOI:10.1002/adsc.200700158
日期:2007.8.6
An organocatalytic, enantioselectivedominoMichael-aldolreaction of 2-mercaptobenzaldehydes with maleimides has been developed. The process, catalyzed by a bifunctional chiralamine thiourea via a hydrogen-bonding mediated activation mechanism using as low as 1 mol % catalyst loading, affords versatile succinimide-containing benzothiopyrans with the generation of 3 stereogenic centers in one single
A versatile synthetic route to 1,5-dithiocins from <i>o</i>-mercapto aromatic aldehydes
作者:Ian WJ Still、Rosanne Natividad-Preyra、F Dean Toste
DOI:10.1139/v98-230
日期:1999.1.1
shown to be unnecessary since even the less reactive aniline readily undergoes the general reaction of primary amines. When simple α-amino acids, or their methyl esters, were employed as the primary amine in the reaction with o-mercaptobenzaldehyde, the formation of the N-alkylated 1,5-dithiocins 4a, 17a,17b with accompanying loss of -COOH or -COOMe was observed, in preparatively useful yields. A mechanism