Silver(I) ion-catalyzed rearrangements of strained .sigma. bonds. XXII. Kinetic deuterium isotope and electronic effects in the silver(I) promoted type .gamma. isomerization of 1-alkyltricyclo[4.1.0.0.2,7]heptanes. Mechanistic analysis of the formation of bicyclo[3.2.0]hept-6-enes
The present invention relates to compounds of formula (I) or pharmaceutically acceptable salts or solvates thereof, processes for their preparation, pharmaceutical compositions containing these compounds, and their use in the treatment of allergic disorders, such as allergic rhinitis and asthma.
Horner–Wadsworth–Emmons olefination, conversion to the allylic moiety, and epoxide ring opening with Et2AlCH2CO2 t-Bu. The allylic substitution of the picolinate with Me2CuMgBr·MgBr2 furnished a quaternary carbon center with 92% ds. Finally, the lactonization of the product, the tert-butyl ester of the seco acid, under acidic conditions, afforded (–)-anastrephin.
Asymmetric Synthesis of 1,2,3-Trisubstituted Cyclopentanes and Cyclohexanes as Key Components of Substance P Antagonists
作者:Jeffrey T. Kuethe、Audrey Wong、Jimmy Wu、Ian W. Davies、Peter G. Dormer、Christopher J. Welch、Michael C. Hillier、David L. Hughes、Paul J. Reider
DOI:10.1021/jo025883m
日期:2002.8.1
An efficient asymmetric synthesis of 1,2,3-trisubstituted cyclopentanes and cyclohexanes is described. Three methods were developed for the preparation of the 2,3-disubstituted cyclopentenones and cyclohexenones, which are key achiral building blocks. These intermediates are reduced catalytically with (R)-2-methyloxazaborolidine in high yield (82-98%) and excellent ee (89-96%). Directed reduction of
Synthesis of Spiro[4.5]decane CF-Ring Analogues of 1α,25-Dihydroxyvitamin D<sub>3</sub>
作者:Wim Schepens、Dirk Van Haver、Maurits Vandewalle、Roger Bouillon、Annemieke Verstuyf、Pierre J. De Clercq
DOI:10.1021/ol061575p
日期:2006.9
A novel series of analogues of calcitriol (1) is developed featuring a spirocyclic central core resulting from C18/C21-connection and C15/C16-deletion (2a, 2b). The synthesis of the key intermediate involves an Eschenmoser rearrangement of an enantiomerically pure bromo-substituted cyclohexenol.
Compounds effective in inhibiting replication of Hepatitis C virus ("HCV") are described. This invention also relates to processes of making such compounds, compositions comprising such compounds, and methods of using such compounds to treat HCV infection.