Intramolecular cyclopropanation reactions en route to novel P-heterocycles
摘要:
The first examples of intramolecular cyclopropanation reactions on a phosphonate template catalyzed by Rh-2(OAc)(4) are described. These reactions proceed in excellent yield and give mixtures of the P-heterocycles cis-2a-d and trans-2a-d with moderate levels of diastereoselectivity. The diastereoselectivity of this transformation is dependent upon the size of the alkyl group R contained in the alkyl alpha-diazodiallylphosphonoacetate starting materials 1a-d. (C) 1999 Elsevier Science Ltd. All rights reserved.
A facile two-step synthesis of methyl bis(2,2,2-trifluoroethyl)phosphonoacetate (Still–Gennari reagent) has been developed by exploiting Garegg–Samuelsson reaction conditions. Starting from trimethyl phosphonoacetate, Still–Gennari reagent was prepared in 94% yield via methyl 2-bis[(trimethylsilyl)oxy]phosphoryl}acetate intermediate. This synthetic procedure was also used to prepare some kinds of
The McKenna reaction – avoiding side reactions in phosphonate deprotection
作者:Katarzyna Justyna、Joanna Małolepsza、Damian Kusy、Waldemar Maniukiewicz、Katarzyna M Błażewska
DOI:10.3762/bjoc.16.119
日期:——
The McKenna reaction is a well-known and popular method for the efficient and mild synthesis of organophosphorus acids. Bromotrimethylsilane (BTMS) is the main reagent in this reaction, which transforms dialkyl phosphonateesters into bis(trimethylsilyl)esters, which are then easily converted into the target acids. However, the versatile character of the McKenna reaction is not always used to its full
Compounds are described that are active on PPARs, including pan-active compounds. Also described are methods for developing or identifying compounds having a desired selectivity profile.
DEALKYLATION OF PHOSPHONATE ESTERS WITH CHLOROTRIMETHYLSILANE
作者:A. J. Gutierrez、E. J. Prisbe、J. C. Rohloff
DOI:10.1081/ncn-100002541
日期:2001.3.31
Chlorotrimethylsilane completely dealkylates phosphonateesters at elevated temperature in a sealed reaction vessel. These conditions are tolerated by a variety of functional groups and lead to high conversions of dimethyl, diethyl and diisopropyl phosphonates to their corresponding phosphonic acids.
Novel cyclohexylacetic acid compounds corresponding to formula I:
processes for the production thereof, pharmaceutical compositions containing these compounds, methods of producing pharmaceutical compositions including these compounds and related methods of treating or inhibiting certain diseases or conditions.