紫杉烷类微管稳定剂是最有效和最广泛使用的化疗药物之一。紫杉烷类的抗癌活性源于其通过选择性识别未组装微管蛋白中的弯曲(c-)构象(与组装微管蛋白中的直(s-)构象相比)来诱导微管蛋白组装的能力。我们首先设计并合成了一系列带有共价基团的3'N修饰的紫杉烷。我们没有发现共价紫杉烷,而是发现了一系列非共价紫杉烷2 ,其中 3'N 侧链由于其将微管蛋白锁定在 s 构象中的作用而被发现对于细胞毒性至关重要。带有丙烯酰胺部分的代表性化合物 ( 2h ) 与紫杉醇相比,对未组装的微管蛋白 c 构象具有更高的结合亲和力,并且细胞毒性更低。对2h左右化学空间的进一步探索提供了新的系列3,其中与紫杉醇相比, 3l等衍生物与微管蛋白的 s 和 c 构象结合更紧密,从而更有效地促进微管蛋白聚合,并具有更大的持久性。药物洗脱后对乳腺癌细胞的体外功效。尽管与紫杉醇相比,3l也具有改善的体内效力,但它也与增加的全身毒性有
The invention provides compounds of the Formula (I)
or a pharmaceutically acceptable salts thereof, wherein X, Y, Z, R
1
, R
2
, R
4
, R
a
, and the subscripts m, p, and q are as described herein. The compounds or their pharmaceutically acceptable salts can modulate the body's production of cyclic guanosine monophosphate (“cGMP”), and are generally suitable for the therapy and prophylaxis of diseases which are associated with a disturbed cGMP balance. The invention also provides pharmaceutical compositions which comprise compounds of Formula (I) or pharmaceutically acceptable salts thereof. The invention also relates to methods for use of the compounds or their pharmaceutically acceptable salts in the therapy and prophylaxis of the abovementioned diseases and for preparing pharmaceuticals for this purpose.
A nona-arginine peptide conjugated with a Re-tricarbonyl IR and fluorescent probe (SCoMPI) accumulates at the epidermis without reaching the dermis.
一种与Re-三羰基IR和荧光探针(SCoMPI)结合的非九精氨酸肽在表皮积累,而不到达真皮层。
The total synthesis of indolizomycin
作者:Guncheol Kim、Margaret Y. Chu-Moyer、Samuel J. Danishefsky、Gayle K. Schulte
DOI:10.1021/ja00054a005
日期:1993.1
The first totalsynthesis of racemic indolizomycin (1) has been achieved. Initial investigations provided the functionalizcd indolizidine, 31, via (i) stereospecific intramolecular vinylsilane/carbinol amide cyclization (15→16), (ii) rhodium(II) acetate mediated diazoacetate insertion into thioamide 17, and (iii) epoxide introduction (25→27→29). Although subsequent attempts to fully elaborate 31 into
Azide/oxygen photocatalysis with homogeneous and heterogeneous photocatalysts for 1,2-aminohydroxylation of acyclic/cyclic alkenes and Michael acceptors
作者:Axel G. Griesbeck、Jörg Steinwascher、Melissa Reckenthäler、Johannes Uhlig
DOI:10.1007/s11164-012-0629-3
日期:2013.1
catalysis step. The lack of rearrangement products in the bicyclic terpene series (pinenes, limonene) accounts for rapid subsequent oxygen trapping and back electron transfer steps. The 1,2-azidohydroperoxidation enables synthesis of 1,2-azidoalcohols and 1,2-aminoalcohols by different reduction protocols. Substrate modification and combination of type II photooxygenation with electron transfer photocatalysis
Two peptidomimetic macrocycles, regioisomeric in terms of the position of triazole/amide, have been synthesized. Both undergo self-assembly in a parallel manner but in solvents of opposite polarity, ascribed to (β, β) and (β-D, β-L) hydrogen bonding leading to formation of two different unique classes of organic nanostructures.