Nanoscale Molecular Rods with a New Building Block for Solubility Enhancement
作者:Pablo Wessig、Kristian Möllnitz
DOI:10.1021/jo800341k
日期:2008.6.1
A new buildingblock bearing a [1,3]dioxolo[4,5-f][1,3]benzodioxole core was developed to enhance the solubility of molecular rods by lateral alkyl chains. On incorporation in molecular rods with oligospiroketal structure, the straight geometry is retained, which was concluded from the X-ray crystal structure analysis of one of the rods. The determination of the solubility of a collection of rods bearing
开发了一种新的带有[1,3] dioxolo [4,5- f ] [1,3]苯并二恶唑核的结构单元,以通过侧链烷基链增强分子棒的溶解性。在掺入具有低螺缩酮结构的分子棒中时,保留了直的几何形状,这是根据其中一根棒的X射线晶体结构分析得出的结论。确定带有该结构单元的棒的集合的溶解度表明,丁基已经有效地阻碍了棒的聚集,因此导致溶解度的显着提高。哌啶环位于杆的末端,这为通用功能化提供了机会。因此,Ñ,Ñ制备了“-双(叠氮乙酰基)-官能化的棒”,该棒可以通过“点击”反应引发的刚性连接。
One-pot synthesis of symmetric 1,7-dicarbonyl compounds via a tandem radical addition–elimination–addition reaction
作者:Zhongyan Huang、Jiaxi Xu
DOI:10.1039/c3ra42932f
日期:——
A novel approach to synthesize symmetric 1,7-dicarbonyl compounds via a tandem radical additionâeliminationâaddition reaction of S-carbonylmethyl xanthates with allylmethylsulfone and its analogues has been developed. Radicals were produced from S-carbonylmethyl xanthates by adding dilauroyl peroxide and reacted with allylmethylsulfone or analogues to generate terminal olefins as intermediates. The excessive radicals reacted with the intermediate olefins immediately to give adducts of symmetric 1,7-dicarbonyl compounds. This is an efficient method to synthesize 1,7-dicarbonyl compounds under mild conditions.
Total synthesis of antitumor agent at-125, (αS,5S)-α-amino-3-chloro-4,5-dihydro-5-isoxazoleacetic acid
作者:Jack E. Baldwin、Jin K. Cha、Lawrence I. Kruse
DOI:10.1016/s0040-4020(01)96774-2
日期:1985.1
A short and efficient totalsynthesis of racemic AT-125 and its racemic threo isomer proceeds via an intramolecular Michael cyclization of a protected α,β-dehydroglutamic acid γ-hydroxamate. Separation of diastereomers and deprotection to racemic AT-125 followed by enzymatic resolution of the N-chloroacetamide with hog-kidney acylase provides the natural αS,5S isomer.
Kinetic effects of sonication on ester hydrolysis and tert-butyl chloridesolvolysis, studied in ethanol–water binary solvent, are discussed in terms of quantitative relationships between their magnitude and the hydrophobicity of reagents. A number of conclusions were drawn from the observed linear free-energy (LFE) relationships. Independent of reaction mechanism, the decrease in reaction rates with
A series of 1,3-benzothiazinone derivatives were designed and synthesized for pharmacological assessments. Among the synthesized 19 compounds, some compounds showed high activities on inhibiting LPS-induced nitrite oxide and TNF-α production, down-regulating COX-2 and increasing IL-10 production in RAW264.7 cells. All the compounds had no obvious cytotoxicity in in vitro assay. LD50 value of compound