Synthesis 2006(4): 603-608  
DOI: 10.1055/s-2006-926294
PAPER
© Georg Thieme Verlag Stuttgart · New York

A New Route to the Synthesis of Pyranoflavone and Pyranochalcone Natural Products and their Derivatives

Yong Rok Lee*, Do Hoon Kim
School of Chemical Engineering and Technology, Yeungnam University, Gyeongsan 712-749, Korea
Fax: +82(53)8104631; e-Mail: yrlee@yu.ac.kr;
Further Information

Publication History

Received 23 May 2005
Publication Date:
11 January 2006 (online)

Abstract

The total synthesis of biologically active pyranoflavone natural products 1 and 2 was carried out starting from 2H-pyran. The synthesis of pyranochalcone natural products, lonchocarpin (9) and 4-hydroxylonchocarpin (10), and their derivatives 30-32 is described. This synthetic route also provides biologically interesting materials such as β-tubaic acid (24), desmethyl isoencecalin (25), and isoencecalin (27).