Synthesis 2010(9): 1512-1520  
DOI: 10.1055/s-0029-1218671
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Synthesis of Optically Pure Lactone Metabolites of Tea Catechins

Masahiro Hamada, Ai Furuno, Sousuke Nakano, Takao Kishimoto, Noriyuki Nakajima*
Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama 939-0398, Japan
Fax: +81(766)562498; e-Mail: nori@pu-toyama.ac.jp;
Further Information

Publication History

Received 11 December 2009
Publication Date:
05 February 2010 (online)

Abstract

Catechins and epicatechins are extremely useful compounds in the context of biological activities. These compounds afford many metabolites, including γ-valerolactone derivatives, through metabolic pathways in the human body. Several of these γ-valerolactone metabolites were synthesized as optically pure authentic standards.

21

(S)-5b was prepared from (R)-7 by a similar procedure to that used to prepare (R)-5b.

22

The ¹³C NMR chemical shifts for the C3, C4 and C5 atoms are observed at δ = 27.23, δ = 79.52, and δ = 41.21, respectively, for (R,S)-14 and at δ = 27.36, δ = 79.66, and δ = 41.31, respectively, for (S,S)-14.