Thermorubin II. 1, 3-Dihydroxy-9H-xanthones and 1, 3-dihydroxy-9H-xanthenes. New methods of synthesis

RKM Pillai, P Naiksatam, F Johnson…

Index: Pillai; Naiksatam; Johnson; et al. Journal of Organic Chemistry, 1986 ,  vol. 51,  # 5  p. 717 - 723

Full Text: HTML

Citation Number: 32

Abstract

13 major product of this reaction is the acylated benzophenone 13, which when heated with base undergoes both hydrolysis and cyclization to afford 14. In practice, 13 need not be purified and overall yields of 14 are satisfactory (Table I, method B). Again the method appears restricted to 1, 3-dihydroxyxanth~ nes~ because the corresponding silyl derivatives of dihydric phenols such as resorcinol and catechol give largely the bis-0-aroylated ...