Efficient Synthesis of 3-Aminocyclobut-2-en-1-ones: Squaramide Surrogates as Potent VLA-4 Antagonists
摘要:
[GRAPHICS]A novel series of uniquely functionalized 3-aminocyclobut-2-en-1-ones has been prepared by facile condensation of a variety of cyclobuta-1,3-diones with a phenylalanine-derived primary amine. These systems subsequently lend themselves to substitution at C-2 by reaction with a variety of electrophilic reagents including N-halosuccinimides, sulfenyl chlorides, and Eschenmoser's salt. Compounds from this novel series are potent antagonists of VLA-4.
A General and Regioselective Synthesis of Cyclopentenone Derivatives through Nickel(0)-Mediated [3 + 2] Cyclization of Alkenyl Fischer Carbene Complexes and Internal Alkynes
作者:José Barluenga、Pablo Barrio、Lorena Riesgo、Luis. A. López、Miguel Tomás
DOI:10.1021/ja075106+
日期:2007.11.1
2-cyclopentenone derivatives 3-6 are synthesized by the nickel(0)-mediated [3 + 2] cyclizationreaction of chromium alkenyl(methoxy)carbenecomplexes1 and internal alkynes2. The reaction takes place with complete regioselectivity with both unactivated alkynes and activated alkynes (electron-withdrawing and electron-donating substituted alkynes). Representative cycloadducts containing boron and tin
synthesis of a vast variety of heteroatom‐containing cyclobutene‐triflones [bis(trifluoromethylsulfonyl)cyclobutenes] and cyclobutenones has been developed starting from heteroatom‐substituted alkynes and a pyridinium salt (a latent Tf2C=CH2 source). This powerful methodology, involving cyclization reactions, allows for the selective preparation of oxygen‐, nitrogen‐, bromine‐, chlorine‐, iodine‐, sulfur‐
从杂原子取代的炔烃和吡啶鎓盐(潜在的Tf 2 C = CH 2来源)开始,开发了可控制的无金属合成各种杂原子的环丁烯-triflones [双(三氟甲基磺酰基)环丁烯]和环丁烯酮。。这种强大的方法涉及环化反应,可以选择性地制备氧,氮,溴,氯,碘,硫,硒,碲,磷和硅官能化的环丁烯衍生物。
Synthesis of Bench-Stable<i>N-</i>Quaternized Ketene<i>N</i>,<i>O</i>-Acetals and Preliminary Evaluation as Reagents in Organic Synthesis
作者:Danielle L. McConnell、Alisha M. Blades、Danielle Gomes Rodrigues、Phoebe V. Keyes、Justin C. Sonberg、Caitlin E. Anthony、Sofia Rachad、Olivia M. Simone、Caroline F. Sullivan、Jonathan D. Shapiro、Christopher C. Williams、Benjamin C. Schafer、Amy M. Glanzer、Holly L. Hutchinson、Ashley B. Thayaparan、Zoe A. Krevlin、Isabella C. Bote、Yasin A. Haffary、Sambat Bhandari、Jack A. Goodman、Max M. Majireck
DOI:10.1021/acs.joc.1c01764
日期:2021.9.17
catalyst-free electrophilic aromaticsubstitutions. N-(1-Ethoxyvinyl)-2-halopyridinium salts can be employed in peptide couplings as a derivative of Mukaiyama reagents or react with amines in nucleophilicaromaticsubstitutions under mild conditions. These preliminary reactions illustrate the broad potential of these currently understudied compounds in organic synthesis.
N -季铵化乙烯酮N , O -缩醛通常是一类不稳定、瞬态的化合物,最常作为反应中间体观察到。在这份报告中,我们描述的一般合成方法的各种工作台稳定Ñ -quaternized烯酮Ñ,ö -acetals经由治疗与炔属醚和适当的布朗斯台德酸或路易斯酸(三氟甲磺酸,三氟甲,或吡啶或苯胺碱三氟甲磺酸钪(III))。所得吡啶鎓盐和苯胺鎓盐可用作多种反应类型的试剂或合成中间体。例如,N -(1-ethoxyvinyl)pyridinium 或anilinium 盐可以热释放高反应性的O-乙基烯酮离子用于无酸催化剂的亲电芳香取代。N -(1-Ethoxyvinyl)-2-halopyridinium 盐可作为 Mukaiyama 试剂的衍生物用于肽偶联,或在温和条件下与亲核芳族取代中的胺反应。这些初步反应说明了这些目前尚未研究的化合物在有机合成中的广泛潜力。
Phenylalanine enamide derivatives
申请人:——
公开号:US20020169336A1
公开(公告)日:2002-11-14
Phenylalanine enamide derivatives of formula (1) are described:
1
wherein
R
1
is a group Ar
1
L
2
Ar
2
Alk- in which:
Ar
1
is an optionally substituted aromatic or heteroaromatic group;
L
2
is a covalent bond or a linker atom or group;
Ar
2
is an optionally substituted arylene or heteroarylene group; and Alk is a chain —CH
2
—CH(R)13 , —CH═C(R)— or
2
in which
R is a carboxylic acid (—CO
2
H) or a derivative or biostere thereof;
X is an —O— or —S— atom or —N(R
2
)— group in which:
R
x
, R
y
and R
z
which may be the same or different is each a hydrogen atom or an optional substituent;
or R
z
is an atom or group as previously defined and R
x
and R
y
are joined together to form an optionally substituted spiro linked cycloaliphatic or heterocycloaliphatic group; and the salts, solvates, hydrates and N-oxides thereof.
The compounds are able to inhibit the binding of integrins to their ligands and are of use in the prophylaxis and treatment of immuno or inflammatory disorders or disorders involving the inappropriate growth or migration of cells.
Phenylalanine enamide derivatives of formula (1) are described:
wherein
R
1
is a group Ar
1
L
2
Ar
2
Alk- in which:
Ar
1
is an optionally substituted aromatic or heteroaromatic group;
L
2
is a covalent bond or a linker atom or group;
Ar
2
is an optionally substituted arylene or heteroarylene group;
and Alk is a chain
in which R is a carboxylic acid (—CO
2
H) or a derivative or biostere thereof;
X is an —O— or —S— atom or —N(R
2
)— group in which:
R
x
, R
y
and R
z
which may be the same or different is each a hydrogen atom or an optional substituent;
or R
z
is an atom or group as previously defined and R
x
and R
y
are joined together to form an optionally substituted spiro linked cycloaliphatic or heterocycloaliphatic group; and the salts, solvates, hydrates and N-oxides thereof. The compounds are able to inhibit the binding of integrins to their ligands and are of use in the prophylaxis and treatment of immuno or inflammatory disorders or disorders involving the inappropriate growth or migration of cells.