Enantioselective Synthesis of α-Amino Acids from N-Tosyloxy β-Lactams Derived from β-Keto Esters
摘要:
A novel synthetic sequence has been developed to convert simple beta-keto esters into enantiomerically enriched alpha-amino acids. The key features of this sequence include the addition of azide to the C3 position of beta-keto ester derived N-tosyloxy-beta-lactams through a concomitant nucleophilic addition/ N-O bond reduction reaction, a mild CsF-induced N1 benzylation of a-azido monocyclic beta-lactams, the preparation of alpha-keto-beta-lactams through a novel four-step sequence from the corresponding 3-azido-1-benzyl-beta-lactams, and TEMPO-mediated ring expansion of these compounds to the corresponding N-carboxy anhydrides (NCAs). In addition, the synthesis, isolation, and characterization of unusual 3-imino and 3-chloramino-beta-lactams is reported.
Enantioselective Synthesis of α-Amino Acids from N-Tosyloxy β-Lactams Derived from β-Keto Esters
摘要:
A novel synthetic sequence has been developed to convert simple beta-keto esters into enantiomerically enriched alpha-amino acids. The key features of this sequence include the addition of azide to the C3 position of beta-keto ester derived N-tosyloxy-beta-lactams through a concomitant nucleophilic addition/ N-O bond reduction reaction, a mild CsF-induced N1 benzylation of a-azido monocyclic beta-lactams, the preparation of alpha-keto-beta-lactams through a novel four-step sequence from the corresponding 3-azido-1-benzyl-beta-lactams, and TEMPO-mediated ring expansion of these compounds to the corresponding N-carboxy anhydrides (NCAs). In addition, the synthesis, isolation, and characterization of unusual 3-imino and 3-chloramino-beta-lactams is reported.
Chemistry of Trichlorosilyl Enolates. 1. New Reagents for Catalytic, Asymmetric Aldol Additions
作者:Scott E. Denmark、Stephen B. D. Winter、Xiping Su、Ken-Tsung Wong
DOI:10.1021/ja9606539
日期:1996.1.1
The asymmetric aldol addition is among the most powerful reactions in synthetic organic chemistry and has been extensively studied over the past 15 years.1 The strategies for reagentcontrolled asymmetricinduction fall into three broadly defined classes (Chart 1): (1) asymmetric modification of the enolate with chiral acyl auxiliaries (A), (2) asymmetric modification of the enolate with chiral metalloid
[EN] INHIBITORS OF CRUZIPAIN AND OTHER CYSTEINE PROTEASES<br/>[FR] INHIBITEURS DE LA CRUZIPAINE ET AUTRES CYSTEINES PROTEASES
申请人:INCENTA LTD
公开号:WO2002057270A1
公开(公告)日:2002-07-25
Compounds of general formula (I) or general formula (II) wherein R1, P1, P2, Q, Y, (X)o, (W)n, (V)m, Z and U are as defined in the specification, are inhibitors of cruzipain and other cysteine protease inhibitors and are useful as therapeutic agents, for example in Chagas' disease, or for validating therapeutic target compounds.
Inhibitors of cruzipain and other cysteine proteases
申请人:——
公开号:US20040127424A1
公开(公告)日:2004-07-01
Compounds of general formula (I): wherein R
1
, R
2
, Y, (X)
o
, (W)
n
, (V)
m
, Z and U are as defined in the specification, are inhibitors of cruzipain and other cysteine protease inhibitors and are useful as therapeutic agents, for example in Chagas' disease, or for validating therapeutic target compounds.
1
INHIBITORS OF CRUZIPAIN AND OTHER CYSTEINE PROTEASES
申请人:Quibell Martin
公开号:US20090247471A1
公开(公告)日:2009-10-01
Compounds of general formula (I) or general formula (II):—
wherein R
1
, P
1
, P
2
, Q, Y, (X)
o
, (W)
n
, (V)
m
, Z and U are as defined in the specification, are inhibitors of cruzipain and other cysteine protease inhibitors and are useful as therapeutic agents, for example in Chagas' disease, or for validating therapeutic target compounds.
Disclosed are alpha keto amide and alpha hydroxy amide compounds and compositions that inhibit soluble epoxide hydrolase (sEH), methods for preparing the compounds and compositions, and methods for treating patients with such compounds and compositions. The compounds, compositions, and methods are useful for treating a variety of sEH mediated diseases, including hypertensive, cardiovascular, inflammatory, pulmonary, and diabetic-related diseases.