Catalytic Asymmetric Transfer Hydrogenation of α-Ketoesters with Hantzsch Esters
作者:Jung Woon Yang、Benjamin List
DOI:10.1021/ol0624373
日期:2006.11.1
C2-symmetric chiral copper(II)-bisoxazolines function as alcohol dehydrogenase mimics and catalyze highly enantioselective transferhydrogenations of alpha-ketoesters with Hantzsch esters as a synthetic NADH analogue to give alpha-hydroxy esters in excellent enantioselectivities. [reaction: see text].
Asymmetric Reaction of α-Diazomethylphosphonates with α-Ketoesters To Access Optically Active α-Diazo-β-hydroxyphosphonate Derivatives
作者:Fei Du、Jiao Zhou、Yungui Peng
DOI:10.1021/acs.orglett.7b00128
日期:2017.3.17
The first example for asymmetric reaction of diazomethylphosphonates with α-ketoesters was realized in the catalysis of hydroquinidine-derived bifunctional thiourea. A methodology was established to access a series of chiral α-diazo-β-hydroxyphosphonate derivatives containing various functional groups with high enantioselectivities and yields. The resulting products could be further transformed into
Organocatalytic Highly Regio- and Enantioselective Umpolung Michael Addition Reaction of α-Imino Esters
作者:Yasushi Yoshida、Takashi Mino、Masami Sakamoto
DOI:10.1002/chem.201703479
日期:2017.9.18
The catalytic asymmetric umpolung reaction of ketimines is of great importance, because it can easily provide chiral amines bearing a tetrasubstitutedcarbon atom on its asymmetric center. Because amino acids with a tetrasubstitutedcarboncenter are useful due to their wide applicability as pharmaceuticals and chiral building blocks, their enantioselective synthesis has great significance in organic
Synthesis of Sterically Congested Acetic Acid Derivatives: The Reaction of Hindered α-Oxo Esters with Pentasubstituted Aryl Grignard Reagents
作者:A. F. Hegarty、P. O'Neill
DOI:10.1055/s-1993-25911
日期:——
The reactions of pentamethylphenylmagnesium bromide and pentachlorophenylmagnesium chloride with tert-butyl 2-oxo-3,3-dimethylbutanoate to give the 2-aryl-2-hydroxy-3, 3-dimethylbutanoate esters were investigated. Attempted acid catalysed dealkylation of the tert-butyl 2-hydroxy-3,3-dimethyl-2-(pentamethylphenyl) butanoate to the corresponding acid was accompanied by skeletal rearrangement, while the corresponding pentachlorophenyl ester reacted normally. The corresponding α- pentachlorophenyl α-α-tert-butyl acetic acid 15 was synthesised without rearrangement. The reaction of pentachlorophenylmagnesium chloride with diisopropyl oxalate gave the α-oxo ester 18, which reacted with pentamethylphenylmagnesium bromide to afford the unsymmetrical diarylacetate ester 22. The corresponding acid chloride 25 could not be converted to the interesting unsymmetrical diarylketene 26.
Heteroaromatic derivatives having an inhibitory activity against HIV integrase
申请人:——
公开号:US20040002485A1
公开(公告)日:2004-01-01
A compound of the formula (I):
1
wherein X is hydroxy, protected hydroxy or optionally substituted amino; Y is —COOR
A
wherein R
A
is hydrogen or ester residue, —CONR
B
R
C
wherein R
B
and R
C
each is independently hydrogen or amide residue, optionally substituted aryl or optionally substituted heteroaryl; and A
1
is optionally substituted heteroaryl; provided that a compound wherein Y and/or A
1
is optionally substituted indol-3-yl is excluded, a tautomer, a prodrug, a pharmaceutically acceptable salt or a hydrate thereof has an inhibitory activity against an integrase.