Radicals a to the carbonyl of ethyl 3,4,4-trimethylpentanoate couple with little stereoselectivity while analogous tertiary radicals derived from ethyl 2,3,4,4-tetramethylpentanoate disproportionate at 25 degrees C to give the corresponding alkene and alkane. The alkane is formed by disproportionation with a diastereoselectivity of greater than 20:1.
CYCLIC TETRAMER COMPOUNDS AS PROPROTEIN CONVERTASE SUBTILISIN/KEXIN TYPE 9 (PCSK9) INHIBITORS FOR THE TREATMENT OF METABOLIC DISORDERS
申请人:NOVARTIS AG
公开号:US20200164024A1
公开(公告)日:2020-05-28
The disclosure relates to inhibitors of PCSK9 useful in the treatment of cholesterol lipid metabolism, and other diseases in which PCSK9 plays a role, having the Formula (I):
or a pharmaceutically acceptable salt, hydrate, solvate, prodrug, stereoisomer, N-oxide, or tautomer thereof, wherein R
1
, R
1
, R
1
, R
1
, R
1
, R
1
, R
1
, R
1
, R
1
, X
1
, X
2
, and X
3
are described herein.
esters 26 and 27 as well as deuterated products 34 and 35 were isolated when the radicals 20 and 21 were trapped with Barton esters 17 and 18 or with PhSeSePh, methyl acrylate or Bu3SnD. In all cases the anti isomers were isolated as the major products in moderate to excellent selectivity. The stereochemical course of the radical reactions can be explained by the allylic strain model.
A facile method for synthesis of three carbon-homologated carboxylic acid by regioselective ring-opening of β-propiolactones with organocopper reagents
β-carbon-oxygen fission to give 3-substituted propionic acids. Among these three kinds of organocopper reagents, diorganocuprate, especially halomagnesium cuprate gave the highest yields of the acids, which was remarkably observed in the ring-opening of sterically hindered β-propiolactones such as β-methyl- and α,β -dimethyl-β-propiolactones and also in the reactions using the organocopper reagents with vinyl and
The present invention relates to novel depsipeptide compounds. The invention also relates to pharmaceutical compositions of these compounds and methods of using these compounds as antibacterial compounds. The invention also relates to methods of producing these novel depsipeptide compounds and intermediates used in producing these compounds.