2,6-Difunctionalization of N-Substituted Dithienothiazines via Dilithiation
摘要:
The regioselective lithiation of dithienothiazines followed by electrophilic trapping in a one-pot fashion is an efficient route to 2-mono- and 2,6-difunctionalized dithienothiazines. A pseudo five-component dilithiation-diformylation-double-Wittig olefination sequence gives a dithienothiazine symmetrically functionalized with ,-unsaturated ester side chains in excellent yield.
4H-Dithieno[2,3-b:3′,2′-e][1,4]thiazines – synthesis and electronic properties of a novel class of electron rich redox systems
作者:Catherine Dostert、Claudia Wanstrath、Walter Frank、Thomas J. J. Müller
DOI:10.1039/c2cc32731g
日期:——
Quantum chemical screening reveals that 4H-dithieno[2,3-b:3',2'-e][1,4]thiazines possess the highest HOMO among four constitutional isomers, even 0.27 eV higher in energy than the well established 10H-phenothiazine. N-Substituted 4H-dithieno[2,3-b:3',2'-e][1,4]thiazines are readily accessible by twofold Pd-catalyzed amination. According to cyclic voltammetry dithienothiazines are reversibly oxidized
Synthesis of dithienothiophenes, cyclopentadithiophene and silacyclopentadithiophenes using palladium-catalyzed cyclization
作者:Masahiko Iyoda、Mami Miura、Shigeru Sasaki、S.M.Humayun Kabir、Yoshiyuki Kuwatani、Masato Yoshida
DOI:10.1016/s0040-4039(97)00979-9
日期:1997.6
The intramolecular cyclization of bromothiophene derivatives with hexamethylditin in the presence of tetrakis(triphenylphosphine)palladium(0) gave dithienothiophenes, cyclopentadithiophene, and silacyclopentadithiophenes in moderate to good yields.
Electron‐Rich Phenothiazine Congeners and Beyond: Synthesis and Electronic Properties of Isomeric Dithieno[1,4]thiazines
作者:Lars May、Thomas J. J. Müller
DOI:10.1002/chem.202000137
日期:2020.9.21
intermolecular–intramolecular Buchwald–Hartwig amination starting from dihalodithienyl sulfides. The electronic properties of dithieno[1,4]thiazine isomers differ conspicuously over a broad range depending on the thiophene–thiazine anellation: a large cathodic (340 mV) or an anodic shift (130 mV) of the redox potentials relative to corresponding phenothiazines is possible. Structure–property relationships of
Synthesis of Dithieno[2,3-<i>b</i>:3‘,2‘-<i>d</i>]thiophenesBuilding Blocks for Cross-Conjugated β-Oligothiophenes
作者:Makoto Miyasaka、Andrzej Rajca
DOI:10.1021/jo060038f
日期:2006.4.1
Syntheses of annelated and functionalized β-trithiophenes (dithieno[2,3-b:3‘,2‘-d]thiophenes), building blocks for the helically annelated, cross-conjugated β-oligothiophenes, are reported. UV−vis spectra reveal that the effect of octyl substituents on the onset of electronic absorption in annelated β-trithiophenes is negligible compared to the effect of helical distortion in the higher β-oligothiophenes
报道了退火和官能化的β-三噻吩(二硫代[2,3- b:3',2'- d ]噻吩)的合成,这是螺旋退火的,交叉共轭的β-低聚噻吩的结构单元。紫外可见光谱显示,与较高的β-低聚噻吩中的螺旋形变形相比,在取代的β-三噻吩中辛基取代基对电子吸收的影响可忽略不计。