An efficient procedure for the synthesis of formylacetic esters
摘要:
An efficient synthesis of formylacetic esters via ozonolysis of trans-beta-hydromuconic esters followed by a solid-supported triphenylphosphine reduction has been developed. In addition, an extension toward formylacetic amides and a one-pot preparation of more stable intermediates which can be used for further transformations are also described. (C) 2012 Elsevier Ltd. All rights reserved.
Design, Synthesis, and Conformational Analysis of a Proposed Type I β-Turn Mimic
作者:Brian E. Fink、Phil R. Kym、John A. Katzenellenbogen
DOI:10.1021/ja974023y
日期:1998.5.1
conformational searching has indicated that this ring system would be a good mimic of a type I β-turn. The synthesis of model tri- and tetrapeptide analogues based on 1 is reported. NMR studies indicate that the tetrapeptide derivatives constrain the i+1 and i+2 torsion angles to within 30° of those predicted for an ideal type I β-turn (φ1 = −82°, ψ1 = −20°, φ2 = −107°, ψ2 = −18°) and that this conformation
desymmetrizing hydroformylation of internal alkenes derivedfrom dihydromuconic acid is described. The study of this reaction afforded easy access to polyfunction aldehydes. After the evaluation of the reactivity of the dimethyl ester derivative with various primary amines, this methodology was used to design a rapid synthesis of (±)-vindeburnol from tryptamine in only two steps.
Synthesis of (tetrahydrofuranyl)tetrahydrofurans via radical cyclization of bis(β-alkoxyacrylates)
作者:Eun Lee、Ho Young Song、Hee Jo Kim
DOI:10.1039/a908456h
日期:——
Radical cyclizations of bis(β-alkoxyacrylates) obtained from (3R,4R)- and meso-1,6-dibromohexane-3,4-diol proceed to form a C2-symmetric and a meso (tetrahydrofuranyl)tetrahydrofuran derivative.
Homocoupling of (Z)-3-halopropenoates using a catalytic amount of NiCl2 and Zn in the presence of water in pyridine afforded a mixture of (Z)- and (E)-3-hexenedioates.
Novel substituted heterocyclic phenoxyamines, the method of preparation
申请人:——
公开号:US04379161A1
公开(公告)日:1983-04-05
The present invention concerns substituted heterocyclic phenoxyamines having the following formula: ##STR1## their pharmacologically acceptable acid salts, their quaternary ammonium salts, their N-oxides, their levorotatory and dextrorotatory isomers and the processes for the preparation thereof. In the above formula: m=0 or 2 n=0 or 2 provided that m+n=2 A represents hydrogen, a lower alkoxy or lower alkenyloxy group, X represents a halogen, R represents hydrogen or a saturated or unsaturated aliphatic and/or cyclic hydrocarbon radical such as in particular lower alkyl, lower alkenyl, cycloalkyl and cycloalkyl-alkyl, cycloalkenyl and cycloalkenyl-alkyl. The compounds of the invention are useful as local anaesthetics.