A variety of di- and trisubstituted thiophenes were synthesized by a one-pot palladium-catalyzed ortho-alkylation sequence terminated by either Heck or C-H coupling. Initial results toward the functionalization of indoles are also presented.
Preferred orientations of the SO bond in methylsulphinyl derivatives of furan and thiophene: an experimental study based on 1H, 13C, and 17O NMR spectroscopy
substitution pattern. The higher degree of coplanarity is found when the methylsulphinyl group and the halogen substituent are in position 3 and 4. Two ortho substituents determine structures with large twists of the methylsulphinyl group. The chemical shifts of 1 H, 13 C and 17 O nuclei of the methylsulphinyl group and referred to spectra in solution do not evidence trends of general validity for all
摘要 用核磁共振技术在溶液中研究了与杂环呋喃和噻吩键合的甲基亚磺酰基的优选构象。甲基亚磺酰基邻位的一个卤素原子的存在决定了 SO 键在与卤素相反的方向上的取向,并且该键与环的共面程度取决于取代模式。当甲基亚磺酰基和卤素取代基位于 3 位和 4 位时,发现更高程度的共面性。两个邻位取代基决定了甲基亚磺酰基大扭曲的结构。1 H 的化学位移,甲基亚磺酰基的 13 C 和 17 O 核和参考溶液中的光谱并未证明所有被检测化合物的普遍有效性趋势,作为甲基亚磺酰基相对于环的取向的函数。这种趋势存在于相应的苯基衍生物的情况下。然而,通过检查长程 n J (C, H) 耦合常数的行为,包括甲基的碳核,连同化学位移,可以得出关于这些分子在溶液中的构象行为的结论。也证明了由介质极性引起的平衡的可能扰动。结果表明,在呋喃的 2-甲基亚磺酰基衍生物中,S0 键优先取向于 O,O-cis 方向并从环平面显着扭曲,但
Structure−Property Investigations of Conjugated Thiophenes Fused onto a Dehydro[14]annulene Scaffold
作者:Matthew J. O’Connor、Robert B. Yelle、Lev N. Zakharov、Michael M. Haley
DOI:10.1021/jo800225u
日期:2008.6.1
A series of 12 thieno-fused macrocycles based on the dehydro[14]annulene framework have been prepared. Studies have focused on the optical and electronic properties of the dehydrobenzothieno[14]annulenes (DBTAs) and dehydrothieno[14]annulenes (DTAs) utilizing NMR spectroscopy, UV−vis spectrophotometry, electrochemistry, and DFT computations. X-ray crystal structures were also obtained for two of the
Synthesis, crystal structure and reactivity of η<sup>2</sup>-thiophyne Ni complexes
作者:Misaki Terada、Yuji Nishii、Masahiro Miura
DOI:10.1039/c8cc00705e
日期:——
The first synthesis and crystalstructures of five-membered ring aryne complexes, Ni(dcpe)(η2-thiophyne) and Ni(dcpe)(η2-benzo[b]thiophyne), are described. The aryne fragments retain considerable aromatic character and the two coordinated carbon atoms exhibit distinct reactivity due to their asymmetric nature.
的五元环芳炔络合物第一合成和晶体结构,镍(η(DCPE)2 -thiophyne)和Ni(DCPE)(η 2 -苯并[ b ] thiophyne),中描述。亚芳基片段保留了相当大的芳族特征,并且两个配位的碳原子由于它们的不对称性质而显示出不同的反应性。
Selective Metallation of 3-Halothiophenes: Practical Methods for the Synthesis of 2-Bromo-3-formylthiophene
Selective lithiation of 3-bromothiophene was accomplished under controlled conditions without formation of undesired thienyllithium compounds. A thienyl Grignard reagent derived from 2-bromo-3-iodothiophene was transformed into 2-bromo-3-formylthiophene in high selectivity by formylation with dimethylformamide (DMF) at optimal reaction temperature.