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Paper | Special issue | Vol 59, No. 1, 2003, pp.217-224
Published online, 1st January, 1970
DOI: 10.3987/COM-02-S23
Convenient Synthesis of a Simple Coumarin from Salicylaldehyde and Wittig Reagent. IV1a-c: Improved Synthetic Method of Substituted Coumarins

Yasuo Takeuchi,* Norihiro Ueda, Koji Uesugi, Hitoshi Abe, Hiromi Nishioka, and Takashi Harayama*

*Faculty of Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Okayama 700-8530, Japan


The reaction of salicylaldehydes (2) with Horner-Wadsworth-Emmons (HWE) or Ando-HWE reagents was attempted to afford intramolecular phosphonate derivatives (6). A new synthetic method for coumarins (1) was achieved by using protected 2.