Conversion of .beta.-amino esters to .beta.-lactams via tin(II) amides
摘要:
Addition of Sn[N(TMS)2]2 to beta-amino esters with sterically nondemanding substituents at C3 or on nitrogen gave beta-lactams in 76-100% yield. More sterically demanding beta-amino esters could be converted to beta-lactams in excellent yield using unsymmetrical tin(II) amide reagents which were prepared in situ. Optimal results for the in situ procedure involved addition of Sn[N(TMS)2]2 to a beta-amino ester, followed by addition of either pivalic acid or N-tert-butylacetamide.
Design and optimization of aspartate N -acetyltransferase inhibitors for the potential treatment of Canavan disease
作者:Bharani Thangavelu、Vinay Mutthamsetty、Qinzhe Wang、Ronald E. Viola
DOI:10.1016/j.bmc.2016.11.060
日期:2017.2
breakdown. The membrane-associated enzymeresponsible for the synthesis of NAA, aspartate N-acetyltransferase (ANAT), has recently been purified and examined (Wang et al., Prot Expr Purif. 2016;119:11). With the availability, for the first time, of a stable and soluble form of ANAT we can now report the identification of initial inhibitors against this biosynthetic enzyme, obtained from the screening of
introduced into eight cyclic peptidomimeticscontaining the Arg‐Gly‐Asp (RGD) sequence. The resulting RGDpeptidomimetics were screened for their ability to inhibit biotinylated vitronectin binding to the purified integrins αvβ3 and αvβ5, which are involved in tumor angiogenesis. Nanomolar IC50 values were obtained for the RGDpeptidomimetics derived from trans DKP scaffolds (DKP‐2–DKP‐8). Conformational
描述了八个双功能二酮哌嗪(DKP)支架的合成。它们正式衍生自2,3-二氨基丙酸和天冬氨酸(DKP - 1 – DKP - 7)或谷氨酸(DKP - 8),具有胺和羧酸官能团。支架在两个立体中心的构型和在二酮哌嗪氮原子上的取代不同。将双功能二酮哌嗪引入了八个具有Arg-Gly-Asp(RGD)序列的环状拟肽中。将所得的肽模拟RGD筛选的能力抑制生物素化的玻连蛋白结合到纯化的整α v β3和α v β 5,其参与肿瘤血管生成。从反式DKP支架(DKP ‐ 2 – DKP ‐ 8)衍生的RGD拟肽获得了纳摩尔IC 50值。通过水溶液中的1 H NMR光谱实验(VT-NMR和NOESY光谱)和Monte Carlo /随机动力学(MC / SD)模拟对环状RGD拟肽进行构象研究,结果表明,亲和力最高的配体具有分子内明确定义的优选构象氢键转弯基序和RGD序列的扩展排列[Cβ(Arg)Cβ(Asp)平均距离≥8
A nuclear magnetic resonance method for distinguishing .alpha.-amino acids from .beta. and .gamma. isomers
作者:Ronald G. Webb、Malcolm W. Haskell、Charles H. Stammer
DOI:10.1021/jo01255a020
日期:1969.3
Uncatalyzed, green aza-Michael addition of amines to dimethyl maleate
作者:Giovanna Bosica、Anthony John Debono
DOI:10.1016/j.tet.2014.06.124
日期:2014.9
Dimethylmaleate was found to be a very reactive and selective acceptor for the aza-Michael addition in comparison to other commonly used electron-deficient alkenes. It reacts efficiently with a variety of aliphatic amines in complete absence of any catalyst and solvent at room temperature. Under these environmentally-friendly conditions, high yields of selectively mono-adducts were obtained within
Conversion of .beta.-amino esters to .beta.-lactams via tin(II) amides
作者:Wei Bo Wang、Eric J. Roskamp
DOI:10.1021/ja00074a007
日期:1993.10
Addition of Sn[N(TMS)2]2 to beta-amino esters with sterically nondemanding substituents at C3 or on nitrogen gave beta-lactams in 76-100% yield. More sterically demanding beta-amino esters could be converted to beta-lactams in excellent yield using unsymmetrical tin(II) amide reagents which were prepared in situ. Optimal results for the in situ procedure involved addition of Sn[N(TMS)2]2 to a beta-amino ester, followed by addition of either pivalic acid or N-tert-butylacetamide.