Reduction of Aliphatic and Aromatic Cyclic Ketones tosec-Alcohols by Aqueous Titanium Trichloride/Ammonia System. Steric Course and Mechanistic Implications
In contrast to the dissolved metal and metal hydride reductions, the reduction of cyclic ketones by the aqueous TiCl3/NH3 system favours the formation of the less thermodynamically stable axial alcohol. The ammonium ion formed in situ is essential for the reduction to proceed because it behaves as a mild Bronsted acid in basic medium and favours the protonation of the intermediate ketyl. The corresponding
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.
Problemes de stereoselectivite en serie du benchrotrene: Reduction d' indanones chrome tricarbonyle á et β Substituees endo et exo par les borohydrures de sodium et de potassium. Stereospecificite de la reaction et applications synthetiques
作者:B. Caro、G. Jaouen
DOI:10.1016/s0022-328x(00)82284-6
日期:1981.11
in protic solvents was stereospecific leading solely to the endo-alcohol whose configuration has been ascertained by IR and NMR. This remarkable stereospecificity together with an easy and quantitative decomplexation of the organometallic alcohols has allowed the liberation of cis-and trans-indanols and initiated a study on the stereochemistry of the reduction by KBH4 of free α- and β-alkylindanones
CATALYTIC ENANTIOSELECTIVE SILYLATIONS OF SUBSTRATES
申请人:Hoveyda Amir H.
公开号:US20090312559A1
公开(公告)日:2009-12-17
The present invention provides methods, compositions and systems for silylation of substrates, including direct asymmetric silylation of a substrate to provide enantiomerically enriched silylated products.
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:US11026993B2
公开(公告)日:2021-06-08
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 R1, R1, R1, R1, R1, R1, R1, R1, R1, X1, X2, and X3 are described herein.