Synthesis 2006(19): 3295-3300  
DOI: 10.1055/s-2006-950196
SPECIALTOPIC
© Georg Thieme Verlag Stuttgart · New York

Reaction of Nitroorganic Compounds Using Thiourea Catalysts Anchored to Polymer Support

Hideto Miyabea, Sayo Tuchidaa, Masashige Yamauchib, Yoshiji Takemoto*a
a Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
Fax: +81(75)7534569; e-Mail: takemoto@pharm.kyoto-u.ac.jp;
b Faculty of Pharmaceutical sciences, Josai University, Keyakidai, Sakado, Saitama 350-0295, Japan
Further Information

Publication History

Received 20 April 2006
Publication Date:
15 August 2006 (online)

Abstract

Immobilization of chiral thiourea catalyst was studied. The PEG-bound thiourea showed better catalytic activity than those of the carboxypolystyrene HL resin-bound and TentaGel carboxy resin-bound thioureas. In the presence of PEG-bound thiourea, Michael and tandem Michael reactions of trans-β-nitrostyrene proceeded enantioselectively.

9

Details are provided in the experimental section.

10

In a previous study on the reaction of 7 using original thiourea 1, the adduct 8 was obtained in 87% yield with 67% ee, after being stirred in CH2Cl2 at room temperature for 24 h. [7c]

12

Poly(ethylene glycol) (Mn 8000) was purchased from Sigma-Aldrich.

13

Characterization data for compounds 6, [14] 8 [7c] and 16 [7g] have been reported.