N-α-Benzyloxyacetyl derivatives of (S)-4-benzyl-5,5-dimethyloxazolidin-2-one for the asymmetric synthesis of differentially protected α,β-dihydroxyaldehydes
摘要:
alpha-Dibenzylamino- and alpha-benzyloxy- derivatives of N-acetyl-(S)-4-benzyl-5,5-dimethyloxazolidin-2-one readily undergo highly stereoselective boron mediated syn-aldol reactions with a range of aromatic and aliphatic aldehydes, generating the syn-aldol products in good to excellent yields as single diastereoisomers after purification. In the alpha-dibenzylamino series, deprotection of the functionalised aldol fragments to the corresponding alpha-amino-beta-hydroxy methyl ester or alpha-amino-beta-hydroxyaldehyde proved problematic, with a range of N- and O-protecting groups giving mixtures of products arising from endocyclic and exocyclic cleavage pathways. However, in the et-benzyloxy series, O-silyl protection of the aldol products, and subsequent DIBAL reduction gives stereoselectively the corresponding N-1'-hydroxyalkyloxazolidin-2-ones, which undergo base promoted fragmentation to the desired highly functionalised and differentially protected alpha,beta-dihydroxyaldehydes in good yields and without loss of stereochemical integrity. (C) 2004 Elsevier Ltd. All rights reserved.
[EN] 6,7-DIHYDRO-4H-PYRAZOLO[1,5-A]PYRAZINE COMPOUNDS FOR THE TREATMENT OF INFECTIOUS DISEASES<br/>[FR] COMPOSÉS DE 6,7-DIHYDRO-4H-PYRAZOLO[1,5-A]PYRAZINE POUR LE TRAITEMENT DE MALADIES INFECTIEUSES
申请人:HOFFMANN LA ROCHE
公开号:WO2018011160A1
公开(公告)日:2018-01-18
The present invention relates to compounds of the formula (I) or pharmaceutically acceptable salts, enantiomer or diastereomer thereof, wherein R1 to R4 are as described above. The compounds may be useful for the treatment or prophylaxis of hepatitis B virus infection.
4-Substituted-5,5-dimethyl oxazolidin-2-ones as effective chiral auxiliaries for enolate alkylations and Michael additions
作者:Stephen G. Davies、Hitesh J. Sanganee
DOI:10.1016/0957-4166(95)00057-v
日期:1995.3
4-(Methyl, phenyl, benzyl, and i-propyl)-5,5-dimethyl-oxazolidin-2-ones, readily available from α-amino acids, are shown to be effective chiralauxiliaries for stereoselective enolate alkylations and conjugate additions of attached N-acyl moieties.
Enantioselective Preparation of <i>P</i>-Chiral Phosphine Oxides
作者:Harry Adams、Rebecca C. Collins、Simon Jones、Christopher J. A. Warner
DOI:10.1021/ol202916j
日期:2011.12.16
efficient chiral auxiliary-based strategy for the asymmetric synthesis of P-chiral phosphineoxides in >98:2 er has been developed. The methodology involves the highly stereoselective formation of P-chiral oxazolidinones that then undergo displacement with a variety of Grignard reagents to prepare the desired phosphineoxides.
A Practical Procedure for the Multigram Synthesis of the SuperQuat Chiral Auxiliaries
作者:Steven D. Bull、Stephen G. Davies、Simon Jones、Mario E. C. Polywka、R. Shyam Prasad、Hitesh J. Sanganee
DOI:10.1055/s-1998-1700
日期:1998.5
An efficient and simple synthesis of oxazolidin-2-one SuperQuat chiral auxiliaries is described which provides rapid access to multigram quantities of the auxiliaries.
[EN] HEPATITIS B ANTIVIRAL AGENTS<br/>[FR] AGENTS ANTIVIRAUX DE L'HÉPATITE B
申请人:ENANTA PHARM INC
公开号:WO2019191166A1
公开(公告)日:2019-10-03
The present invention discloses compounds of Formula (I), and pharmaceutically acceptable salts, esters, or prodrugs thereof which inhibit the protein(s) encoded by hepatitis B virus (HBV) or interfere with the function of the HBV life cycle of the hepatitis B virus and are also useful as antiviral agents. The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from HBV infection. The invention also relates to methods of treating an HBV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention.