Novel phenoxyalkylamine derivatives. IV. Synthesis, Ca2+-antagonistic activity and quantitative structure-activity analysis of .ALPHA.-isopropyl-.ALPHA.-(3-(3-(3-methoxyphenoxy)propylamino)propyl)-.ALPHA.-phenylacetonitrile derivatives.
摘要:
制备了α-异丙基-α-[3-[3-(3-甲氧基苯氧基)丙氨基]丙基]-α-苯乙腈衍生物,并评估了它们的 Ca2+ 拮抗活性。在这些化合物中,发现在 A 环上具有 m-OMe、p-F、p-Cl、3,4-(OMe) 2 和 3,5-(OMe) 2 取代基的 N-Me 衍生物比维拉帕米具有更高的 Ca2+ 拮抗活性。利用物理化学取代基参数和回归分析对 A 环上取代基的影响进行了定量研究。分析结果表明,π值接近于零的取代基对活性有利,而 m 和 p 取代基存在最佳立体条件,相当于 m-OMe 和 p-F 或 p-Cl。对同时改变 A 环、苯氧基苯环(B 环)和季碳原子上的取代基的全系列类似物进行的分析表明,除了特定位置的立体效应和疏水效应外,还存在最佳的分子疏水性,这可能参与了向作用部位的迁移过程。
From donor and acceptor substitutedmeta- andpara-xylenes topara-Quinodimethanes and Poly(meta-phenylenevinylene)s
摘要:
Ortho-, meta-and para-xylenes 1, 13a, 13b and 13c, with donor and acceptor substituents at the alpha- and alpha' positions, lead to a remarkable variety of intermediates and reaction products after deprotonation of the benzylic proton. Thus, the reaction of para-(cyanomethyl)dialkyl[(methylthio)phenylmethylene] ammonium tetrafluoroborates 13a and 13b with sodium hydride affords the para-quinodimethanes 14a and 14b. Poly(meta-phenylenevinylene) 14c can be obtained when starting from 13c. We report the synthesis of para-quinodimethanes 14a and 14b and poly(metaphenylenevinylene) 14c and describe a successive approach towards meta-phenylenevinylenes of definite length 16b and 17b starting from 12d. Moreover, we compare the stability and reactivity of para-quinodimethane 14a and 14b with those of the ortho-quinodimethane 2 and we focus on the characterization of the resulting donor and acceptor substituted compounds.
Computer‐Driven Development of Ylide Functionalized Phosphines for Palladium‐Catalyzed Hiyama Couplings
作者:Jonas F. Goebel、Julian Löffler、Zhongyi Zeng、Jens Handelmann、Albert Hermann、Ilja Rodstein、Tobias Gensch、Viktoria H. Gessner、Lukas J. Gooßen
DOI:10.1002/anie.202216160
日期:2023.2.20
Ylidefunctionalizedphosphines were tailored supported by computational inverse catalyst design to fit the requirements of mild Hiyamacouplings of aryl chlorides. YPhos/Pd catalyst is highly efficient for the coupling with aryl chlorides in general, and the reaction shows excellent functional group compatibility.