Ruthenium(II)-Catalyzed Synthesis of Hydroxylated Arenes with Ester as an Effective Directing Group
摘要:
An unprecedented Ru(II) catalyzed ortho-hydroxylation has been developed for the facile synthesis of a variety of multifunctionalized arenes from easily accessible ethyl benzoates with ester as an efficient directing group. Both the TFA/TFAA cosolvent system and oxidants serve as the critical success factors in this transformation. The reaction demonstrates excellent reactivity, good functional group tolerance, and high yields.
A new strategy for the synthesis of 3,5-disubstituted phenols is established through one-pot Robinson annulation of α,β-unsaturated ketones with α-fluoro-β-ketoesters followed by in situ dehydrofluorination and tautomerization. This method has been extended to the synthesis of polysubstituted phenols and applied in the preparation of biologically active compounds.
The present invention provides methods for the use of compounds having formula (I) in the treatment of various disorders including inflammatory or autoimmune disorders, and disorders involving malignancy or increased angiogenesis, wherein R
1
-R
11
, t, X, Y, Z, and n are as defined herein.
Synthesis of dibenzo[b,d]pyran-6-ones based on a ‘[3+3] cyclization–Suzuki cross-coupling’ strategy
作者:Van Thi Hong Nguyen、Peter Langer
DOI:10.1016/j.tetlet.2004.12.030
日期:2005.2
Functionalized dibenzo[b,d]pyran-6-ones were prepared by sequential '[3+3] cyclization-Suzuki cross-coupling' reactions. (C) 2004 Elsevier Ltd. All rights reserved.
Friedrichsen,W., Justus Liebigs Annalen der Chemie, 1975, p. 1545 - 1562