Lithioarene Cycliacylation and Pd-Catalyzed Aminoethylation/Cyclization to Access Electronically Diverse Saturated Isoquinoline Derivatives
作者:Marek Buchman、Elliot P. Farney、Stephen N. Greszler、Robert J. Altenbach、Gregory A. Gfesser、Eric A. Voight
DOI:10.1021/acs.joc.1c02302
日期:2022.1.7
for the synthesis of substituted dihydroisoquinolinones and tetrahydroisoquinolines from readily accessible o-bromobenzyl bromides and o-bromobenzaldehydes, respectively. While classical electrophilic aromatic substitution reactions are tailored to the construction of saturated isoquinolines derived from electron-rich precursors, we demonstrate efficient syntheses from electronically diverse substrates
Making light work of chromism: Enantioselective photochromic ring‐closing reactions of three bisthienylethene compounds possessing either no or two hydroxy groups were carried out in the hydrophobic pockets of humanserumalbumin (HSA) in aqueous media. When 10 equivalents of HSA were used, 1,2‐bis(5‐hydroxymethyl‐2‐methyl‐3‐thienyl)hexafluorocyclopentene predominantly produced the S,S closed form
轻松进行色差工作:在水性介质中人血清白蛋白(HSA)的疏水口袋中,进行了三种不具有或不具有两个羟基的联苯乙炔乙烯化合物的对映选择性光致变色闭环反应。当使用10当量的HSA时,在63中的1,2-双(5-羟甲基-2-甲基-甲基-3-噻吩基)六氟环戊烯主要生成S,S封闭形式(参见方案; O =开放,C =封闭) % ee值在室温和71% ee值在用313nm的光照射在-4℃。
Bis(thienyl)ethenes with α-methoxymethyl groups. Syntheses, spectroscopic Hammett plots, and stabilities in PMMA films
of the spectroscopic Hammett equation and the Hammett–Brown equation. Excellent correlations of these linear free energy relationships were found, when the σp values of the Hammett equation, which summarize inductive, mesomeric and field effects, were replaced to the Hammett–Brown σp+ and σp− values which also take direct conjugation into account. We studied solvent effects on the spectroscopic properties
制备并测试了一系列在噻吩的 2/2'-位具有全氟环戊烯主链和甲氧基甲基(MOM)的双(噻吩基)乙烯(BTE)。5/5'位的取代模式多种多样,涵盖从给电子到吸电子的范围。利用光谱Hammett方程和Hammett-Brown方程研究了通过可逆6π-电环化和环化逆转相互转化的开环和闭环异构体吸收波长的取代基效应。当总结感应效应、介观效应和场效应的哈米特方程的σ p值替换为也采用直接共轭的哈米特-布朗σ p +和σ p −值时,发现这些线性自由能关系具有极好的相关性考虑到。我们研究了溶剂对光谱特性的影响,并将 BTE 嵌入聚甲基丙烯酸甲酯 (PMMA) 涂层中以检查其抗疲劳性。通过我们的研究,BTE 的光谱特性可以通过改变取代模式来调整,以达到切换过程所需的激发波长。