Disclosed herein are compounds of formula (I) or pharmaceutical acceptable salts thereof,
wherein A, X
1
, X
2
, R
1
, R
2
, R
3
, m, n, and p are defined in the specification. Compositions including the compounds which can be useful for inhibiting Rho kinase (ROCK) and methods for using the compositions are also described.
Enhanced asymmetric induction in cycloadditions to bridgehead-chiral vinyl dioxazaborocines
作者:Christopher D Davies、Stephen P Marsden、Elaine S.E Stokes
DOI:10.1016/s0040-4039(00)00571-2
日期:2000.5
Vinyl dioxazaborocines 5 with asymmetric centres on the nitrogen bridgehead substituent have been prepared and assayed in nitrile oxide and nitrone cycloadditions, giving asymmetricinductions of up to 70 and 74% ee, respectively.
Structural modification and biological activity studies of tagitinin C and its derivatives
作者:Thi Hang Au、Charles Skarbek、Stephanie Pethe、Raphael Labruere、Jean-Pierre Baltaze、Thi Phuong Hoa Nguyen、Thi Thu Ha Vu、Giang Vo-Thanh
DOI:10.1016/j.tet.2021.132248
日期:2021.7
amines, phosphonates and thiols to Tagitinin C containing in its structure an α-methylene-γ-lactone motif and two α,β-unsaturated ketone systems has been described. 27 Tagitinin C derivatives were synthesized and isolated in good to excellent yield (up to 99% yield) under mild reaction conditions. The biologicalactivity of Tagitinin C and its derivatives were evaluated against three human cancer cell
胺、膦酸酯和硫醇与 Tagitinin C 的迈克尔加成反应在其结构中包含一个 α-亚甲基-γ-内酯基序和两个 α,β-不饱和酮系统已被描述。在温和的反应条件下,合成并分离了 27 种 Tagitinin C 衍生物,收率非常好(收率高达 99%)。Tagitinin C 及其衍生物对三种人类癌细胞系(乳腺癌人类癌细胞 MCF-7、对药物 MCF7-MDR 多重耐药的乳腺癌人类癌细胞、胰腺癌细胞 MiaPaCa-2)和正常细胞的生物活性进行了评估线(HEK-293)作为对照。我们表明 Tagitinin C 衍生物的生物活性仍然存在。这些化合物具有增强的水溶性,可以提高其生物利用度和药理学特征。
Chirality-Driven Folding of Short β-Lactam Pseudopeptides
residues. Long-range chiral effects on the α-lactam pseudopeptide conformers were also found when two (i) and (i + 3) chiral residues were attached to the termini of a central -(β-lactam)-(Aib)- segment. In such mimetics, heterochiral (i) and (i + 3) residues reinforced a β-II turn conformer, whereas homochiral corner residues stabilized an overlapped β-II/ β-I double turn motif. No β-hairpin nucleation
新型的对映纯假肽模型,其包含中心-(β-内酰胺)-(Aa)-骨架,其特征在于α-烷基-α-氨基-β-内酰胺(i +1)残基和α-取代的(i + 2)氨基酸很容易从α-烷基丝氨酸合成。使用1D-和2D-NMR技术在CDCl 3和DMSO- d 6溶液中进行的此类β-内酰胺假肽的构象分析显示,β-II转角和γ转角构象异构体之间达到平衡,该平衡最终由β-内酰胺构象的相对构型调节。 -(β-内酰胺)-(Aa)-残基。当两个(i)和(i+3)手性残基连接至中心-(β-内酰胺)-(Aib)-链段的末端。在此类模拟物中,杂手性(i)和(i + 3)残基增强了β-II转弯构象异构体,而同手性角残基则稳定了重叠的β-II/β-I双转弯基序。在任何情况下均未观察到β-发夹形核。与溶液中发现的构象异构体高度吻合,还通过X射线晶体学表征了β转向和开放结构。在B3LYP / 6-31 ++ G **计算水平上计算不
Total Synthesis and Absolute Stereochemical Assignment of (−)-Communesin F
作者:Zhiwei Zuo、Weiqing Xie、Dawei Ma
DOI:10.1021/ja106739g
日期:2010.9.29
A concise asymmetric totalsynthesis of (-)-communesinF (∼6% overall yield in the longest linear sequence of 19 steps) is described. It features an unprecedented intramolecular oxidative coupling strategy for the elaboration of the requisite spiro-fused indoline moiety. Other notable elements are the use of TBS-protected (S)-phenylglycinol as a chiral auxiliary to induce the asymmetric formation of
描述了 (-)-communesin F 的简洁不对称全合成(在最长的 19 步线性序列中总产率约为 6%)。它具有前所未有的分子内氧化偶联策略,用于构建必需的螺融合二氢吲哚部分。其他值得注意的元素是使用 TBS 保护的 (S)-苯基甘氨醇作为手性助剂来诱导螺旋稠合二氢吲哚部分的不对称形成、甲磺酸盐介导的 G 环形成,以及在最后阶段通过分子内施陶丁格反应。这种分子内施陶丁格反应在 80 °C 下顺利进行,提供了一个额外的例子,说明扭曲的酰胺比简单的酰胺更具反应性。随着全合成,我们能够将天然公社素 F 的绝对构型指定为 6R,