Processes for producing a compound represented by the formula (1), which includes an acrylic acid derivative and is useful as an agricultural chemical or medicine. One of the processes comprises the step of formulating a compound (3) and converting the OH of the resultant compound (2) into OR″. The first step comprises reacting a formic or orthoformic ester in the presence of a Lewis acid and a base. The second step comprises reacting the compound with R″OH or with R″OH and CH(OR″)
3
under acidic conditions or using a phase-transfer catalyst in a two-phase system and regulating the base and the concentration thereof to stereoselectively synthesize the target compound. In another, process, the compound is efficiently produced without isolating the compound. The compound can also be produced without the compound (2).
1
2-thiomethyl-substituted-1,4-dihydropyridines, method for their
申请人:Boehringer Biochemia Robin S.p.A.
公开号:US04999362A1
公开(公告)日:1991-03-12
Compounds of formula I ##STR1## wherein R.sub.1 is an alkoxycarbonyl group, acetyl, benzoyl, cyano, nitro or aminocarbonyl; R.sub.2 is an optionally substituted aryl or hetaryl group; R.sub.3 is an alkoxycarbonyl group; .phi. is a thio residue such as alkylthio, cycloalkylthio, arylthio, heteroarylthio, aminoalkylthio, are described. Compounds I are useful in human therapy as antihypertensive, antiulcer, antithrombotic, antiischaemic agents.
Gallium(III) Tetraphenylporphyrinates Containing Hydrosulfide and Thiolate Ligands: Structural Models for Sulfur-Bound Iron(III) Hemes
作者:Daniel J. Meininger、Max Chee-Garza、Hadi D. Arman、Zachary J. Tonzetich
DOI:10.1021/acs.inorgchem.5b02822
日期:2016.3.7
Gallium(III) tetraphenylporphyrinates (TPP) containing anionic sulfur ligands have been prepared and characterized in the solid state and solution. The complexes serve as structural models for iron(III) heme sites containing sulfur coordination that otherwise prove challenging to synthesize due to the propensity for reduction to iron(II). The compounds prepared include the first well-characterized
已制备了含有阴离子硫配体的四苯基卟啉镓(III)(TPP),并在固态和溶液中进行了表征。该络合物用作包含硫配位的铁(III)血红素位点的结构模型,否则由于还原成铁(II)的倾向而证明合成具有挑战性。所制备的化合物包括第一个很好表征的三价金属卟啉酸盐,其中包含末端氢硫化物配体[Ga(SH)(TPP)]以及[Ga(SEt)(TPP)],[Ga(SPh)(TPP) )]和[Ga(SSi i Pr 3)(TPP)]。这些化合物对还原的稳定性允许对其固态结构和电化学进行研究。讨论了与铁(III)类似物有关的配合物的结构特征和反应化学。
Iron(II) Corrole Anions
作者:Kenneth P. Caulfield、Jeanet Conradie、Hadi D. Arman、Abhik Ghosh、Zachary J. Tonzetich
DOI:10.1021/acs.inorgchem.9b02209
日期:2019.11.18
2), as likely contenders for the ground state of [FeII(TPC)]−, with the optimized geometry of the former in slightly better agreement with the low-temperature X-ray structure. Solutions of 3a react with carbon monoxide to afford the low-spin (S = 0) complex, [Fe(TPC)(CO)]−, whereas introduction of oxygen at −78 °C leads to a putative O2 adduct, [Fe(TPC)(O2)]−, which decays rapidly even at low temperatures
用KC 8还原[Fe(TPC)(THF)](TPC = 5,10,15-三苯基Corrole的三价阴离子)生成铁(II)Corrole阴离子K(THF)2 [Fe II(TPC)](3a)。化合物3a代表分离并在晶体学上表征的二价铁的络合物的第一个实例。该化合物采用中间自旋态(S = 1),在铁原子周围显示出正方形平面的几何形状。使用STO-TZP基集的全电子密度泛函理论(OLYP和B3LYP)计算表明,两个基本等能量的d电子构型为d xy 2 d z 2 2 d xz 1 dyz 1(占领1)和d xy 2 d z 2 1 d xz 1 d yz 2(占领2),可能是[Fe II(TPC)] -基态的竞争者,前者的最佳几何形状为与低温X射线结构的一致性略好。解图3a与一氧化碳反应,得到低自旋(小号= 0)复合物,的[Fe(TPC)(CO)] - ,而引入氧气在-78℃通入推定Ô 2加成物,[铁(TPC)(O
Low-Spin Pseudotetrahedral Iron(I) Sites in Fe<sub>2</sub>(μ-S) Complexes
作者:John S. Anderson、Jonas C. Peters
DOI:10.1002/anie.201401018
日期:2014.6.2
comprising three nearly isostructural but electronically distinct Fe2(μ‐S) species. Combined structural, magnetic, and spectroscopic studies provided strong evidence that the pseudotetrahedraliron centers undergo a transition to low‐spin S=1/2 states upon reduction from FeII to FeI. The possibility of accessing low‐spin, pseudotetrahedral FeI sites compatible with S2− as a ligand was previously unknown.
尽管人们对异常低价铁在具有铁硫簇的金属酶中的可能作用越来越感兴趣,但铁硫化物复合物中的Fe I中心在合成化学中几乎没有先例。一系列三个二铁 [(L 3 Fe) 2 (μ-S)] 配合物被分离出来并表征为低价氧化态 Fe II S Fe II、Fe II S Fe I和 Fe I S Fe I被描述。这个硫化铁家族构成了一个独特的氧化还原系列,包括三个几乎同构但电子不同的 Fe 2 (μ-S) 物种。结合结构、磁性和光谱研究提供了强有力的证据,表明伪四面体铁中心在从 Fe II还原为 Fe I 时经历了向低自旋S = 1/2 状态的转变。获得与 S 2-兼容的低自旋假四面体 Fe I位点作为配体的可能性以前是未知的。