A Straightforward Synthesis of Polyketides via Ester Dienolate Matteson Homologation
作者:Oliver Andler、Uli Kazmaier
DOI:10.1002/chem.202004650
日期:2021.1.13
for the stereoselective synthesis of highly substituted α,β‐unsaturated δ‐hydroxy carboxyl acids, structural motifs widespread found in polyketide natural products. The protocol is rather flexible and permits the introduction of substituents and functionalities also at those positions which are not accessible by the commonly used aldol reaction. Therefore, this ester dienolate Matteson approach is an
Synthesis of 2-Hydroxy-3-oxocarboxylic Esters From the Corresponding α,β-Unsaturated Esters by a Simple One-Step Procedure
作者:D. H. G. Crout、D. L. Rathbone
DOI:10.1055/s-1989-27142
日期:——
A convenient one-step synthesis of 2-alkyl-2-hydroxy-3-oxocarboxylic esters by potassium permanganate oxidation of the corresponding readily available α,β-unsaturated esters is described. Preparation of the latter by the phosphonate modification of the Wittig reaction is also reported.
The present invention provides C
1-6
alkyl-4-amino-azepan-3-one protease inhibitors and pharmaceutically acceptable salts, hydrates and solvates thereof which inhibit proteases, including cathepsin K, pharmaceutical compositions of such compounds, novel intermediates of such compounds, and methods for treating diseases of excessive bone loss or cartilage or matrix degradation, including osteoporosis; gingival disease including gingivitis and periodontitis; arthritis, more specifically, osteoarthritis and rheumatoid arthritis; Paget's disease; hypercalcemia of malignancy; and metabolic bone disease; and parasitic diseases, including malaria, by administering to a patient in need thereof one or more compounds of the present invention.
Electrophile-Controlled Regiodivergent Palladium-Catalyzed Imidoylative Spirocyclization of Cyclic Alkenes
作者:Shumin Ding、Yue Pu、Jiao Lin、Haixia Zhao、Qiang Tang、Jian Wang
DOI:10.1021/acs.orglett.4c00181
日期:2024.3.8
spirocyclization of isocyano cycloalkenes has been developed, offering efficient and selective approaches toward spirocyclic hydropyrrole scaffolds. 2-Azaspiro-1,7-dienes could be obtained through a “chain-walking” process with aryl/vinyl iodides as electrophiles, while the normal Heck product 2-azaspiro-1,6-dienes were selectively generated when aryl triflates were used as the coupling partner of isocyanides