β-Deprotonation by lithium di-isopropylamide. Vinyl carbanions from oxygen heterocycles in the synthesis of carboxylic acids in the benzofuran, flavone, and coumarin series and in the regiospecific acylation of 2,6-dimethylchromone
作者:Ana M. B. S. R. C. S. Costa、Francis M. Dean、Michael A. Jones、Dennis A. Smith、Rajender S. Varma
DOI:10.1039/c39800001224
日期:——
Lithiumdi-isopropylamide at –70 °C can remove the α-proton frombenzofuran in the absence of activating groups and the β-proton if such groups are present; in flavone and 4-methoxycoumarin β-deprotonation occurs readily and the carbanions are easily carboxylated giving acids not previously accessible, while in 2,6-dimethylchromoneβ-deprotonation is kinetically favoured allowing 3-acylation to be
The present invention discloses novel derivatives of isoflavones, in particular carboxy derivatives of isoflavones, active as selective estrogen receptor modulators, and uses of the carboxy derivatives for the treatment of estrogen-related conditions. The present further discloses conjugates of these carboxy derivatives of isoflavones and their use for affinity targeting of drugs, imaging and detection agents to cells having estrogen receptors, particularly estrogen receptors subtype β.