On the scope of the double Ugi multicomponent stapling to produce helical peptides
作者:Manuel G. Ricardo、Yadiel Vázquéz-Mena、Yuleidys Iglesias-Morales、Ludger A. Wessjohann、Daniel G. Rivera
DOI:10.1016/j.bioorg.2021.104987
日期:2021.8
multicomponent stapling approach in its capacity to produce helicalpeptides from unstructured sequences. For this, three different stapling combinations were implemented and the CD spectra of the cyclic peptides were measured to determine the effect of the multicomponent macrocyclization on the resulting secondary structure. A new insight into some structural factors influencing the helicity type and content
通过肽钉合方法稳定螺旋结构现在是一种成熟的技术,能够提供各种生物医学应用。最近,表明多组分大环化不仅是引入构象约束的有效方法,而且还允许在一锅法中将额外的功能结合到主食部分。这项工作调查了双 Ugi 多组分装订方法在从非结构化序列中产生螺旋肽的能力方面的范围。为此,实施了三种不同的装订组合,并测量了环肽的 CD 光谱,以确定多组分大环化对所得二级结构的影响。
Catalytic N-diphosphonomethylation of amino alkanols and bisamino alkanes using tris(trimethylsilyl) phosphite as a convenient synthon
作者:Andrey A. Prishchenko、Roman S. Alekseyev、Olga P. Novikova、Mikhail V. Livantsov、Ludmila I. Livantsova、Valery S. Petrosyan
DOI:10.1016/j.jorganchem.2021.122143
日期:2022.1
The new mono- and bis(aminomethylenediphosphonic) acids are synthesized for the first time via unique reaction of tris(trimethylsilyl) phosphite and various N-formyl amino alkanols or bis(N-formyl amino) alkanes at the presence of effective catalyst – trimethylsilyl triflate under mild conditions. The further treatment of initially formed trimethylsilyl intermediates with the methanol excess resulted
Stereoselective Aldol Additions of Achiral Ethyl Ketone-Derived Trichlorosilyl Enolates
作者:Scott E. Denmark、Son M. Pham
DOI:10.1021/jo034092x
日期:2003.6.1
ethyl ketoneenolates have been developed. The addition of enoxy(trichlorosilanes) (trichlorosilylenolates) to aldehydes proceeds with good yields in the presence of catalytic amounts of chiral phosphoramides. The reaction of Z-trichlorosilyl enolates to aryl aldehydes affords aldol products with good to excellent diastereo- and enantioselectivities. Phosphoramide-catalyzed aldoladditions lacked
Reaction of bidentate isonitrile ligands with iron carbonyls
作者:James A. S. Howell、Anthony J. Rowan
DOI:10.1039/dt9810000297
日期:——
Reaction of the bidentate isonitriles CN(CH2)nNC (n= 2, 3, 4, or 6) with [Fe2(cp)2(CO)4](cp =η-cyclopentadienyl) yields exclusively [Fe2(cp)2(CO)3}2CN(CH2)nNC}] derivatives which are fluxional in solution and exist in three isomeric forms (bridged–bridged, bridged–terminal, and terminal–terminal with respect to the bonding mode of the bidentate isonitrile). The proportion of the isomers containing
Neutral isocyanide-templated assembly of pillar[5]arene [2] and [3]pseudorotaxanes
作者:Korawit Khamphaijun、Phitawat Namnouad、Andrew Docker、Araya Ruengsuk、Jonggol Tantirungrotechai、Raúl Díaz-Torres、David J. Harding、Thanthapatra Bunchuay
DOI:10.1039/d2cc02255a
日期:——
Unprecedented pillar[5]arene–isocyanide pseudorotaxane complexes are reported. Extensive 1H-NMR experiments reveal remarkably strong binding affinities of alkyl diisocyanide guests (Ka > 105 M−1 in CDCl3) by pillar[5]arenes. Characterised by multinuclear 1H and 13C-NMR spectroscopy and single-crystal X-ray diffraction, it is demonstrated that pillar[5]arenes are capable of encapsulating a series of
报道了前所未有的柱[5]芳烃-异氰化物假轮烷配合物。广泛的1 H-NMR 实验揭示了柱 [5] 芳烃对烷基二异氰化物客体(CDCl 3中的Ka > 10 5 M -1 )具有非常强的结合亲和力。以多核1 H 和13为特征C-NMR光谱和单晶X射线衍射表明柱[5]芳烃能够包封一系列烷基二异氰化物,其中通过改变烷基链可以形成[2]-或[3]假轮烷长度。此外,缺电子芳基异氰化物被证明可以在由多个 C-H⋯π 相互作用稳定的柱 [5] 芳烃的空腔内形成包合物。