Microwave-assisted synthesis of the (E)-α-methylalkenoate framework from multifunctionalized allylic phosphonium salts
作者:Lidiane Meier、Misael Ferreira、Marcus M. Sá
DOI:10.1002/hc.21001
日期:——
A convenient and general microwave-assisted method for the synthesis of stereochemicallydefined α-methylalkenoic acids and esters from allylic phosphonium salts in a basic aqueous medium is described. A selective preparation of acids or esters was dependent on the base (NaOH or NaHCO3) employed in the reaction and could be achieved with good to excellent yields under mild conditions in the absence
New allyldithiocarbimate salts: Synthesis, structure and antifungal activity
作者:Nathália M. Albuini-Oliveira、Mayura M.M. Rubinger、Silvana Guilardi、Rafael A.C. Souza、Javier Ellena、Natalia Alvarez、Eder C. Tavares、Carlos H.C. Zacchi、Antonio E.C. Vidigal、Marcelo S. Lima、Laercio Zambolim
DOI:10.1016/j.molstruc.2020.128149
日期:2020.8
interactions present in the new substances and to explain variations observed on their melting points. Single crystal X-ray diffraction experiments confirmed the Z stereochemistry of the allyldithiocarbimate anions. C–H ⋯ O, C–H ⋯ N, C–H ⋯ S and C–H ⋯ π intermolecular interactions in the solid state were studied by X-ray diffraction and Hirshfeld surface analyses. The new compounds inhibited the mycelial
摘要 由不同的烯丙基溴化物和各种二硫代氨基甲酸钾制备了 15 种新的烯丙基二硫代氨基甲酸酯,得到 (Z)-2-(甲氧基羰基)-3-(X-硝基苯基)烯丙基-(NR-磺酰基)二硫代氨基甲酸酯(其中 X = 2、3 和 4 ;R = 苯基、4-氟苯基、4-氯苯基、4-溴苯基和 4-碘苯基)。这些阴离子被分离为四苯基鏻盐,并通过 HRMS、红外、1H 和 13C NMR 光谱进行表征。分子静电势用于评估新物质中存在的分子间相互作用,并解释观察到的熔点变化。单晶 X 射线衍射实验证实了烯丙基二硫代氨基甲酸根阴离子的 Z 立体化学。C-H⋯O, C-H⋯N, 通过 X 射线衍射和 Hirshfeld 表面分析研究了固态中的 C-H⋯S 和 C-H⋯π 分子间相互作用。新化合物抑制了导致严重植物病害的各种真菌物种的菌丝体生长。烯丙基硫代氨基甲酸酯对灰葡萄孢特别有活性,IC50 值低至 20 μM,比商业杀菌剂
Exploring the reaction of multifunctional allylic bromides with N,S-dinucleophiles: isothiouronium salts and analogs as useful motifs to assemble the 1,3-thiazine core
作者:Marcus Mandolesi Sá、Misael Ferreira、Adailton J. Bortoluzzi、Luciano Fernandes、Silvio Cunha
DOI:10.3998/ark.5550190.0011.b24
日期:——
The reactivity profile of allylic bromides (derived from the Morita-Baylis-Hillman reaction) towards thioureaderivatives and further transformations of the resulting isothiuronium bromides are described. Isothiuroniumsalts, prepared in near quantitative yields, undergo a selective acetylation or a base-promoted intramolecular cyclization to give 2-amino-1,3-thiazin-4-ones in good overall yields.
Formal [3+2] Annulation Involving Allylic Bromides and Thioureas. Synthesis of 2-Iminothiazolidines through a Base-Catalyzed Intramolecular<i>anti</i>-Michael Addition
作者:Misael Ferreira、Marcus M. Sá
DOI:10.1002/adsc.201401026
日期:2015.3.9
A simple and efficient protocol was developed for the synthesis of 2‐iminothiazolidines through a base‐mediated [3+2] annulation involving substituted thioureas and allylic bromides bearing electron‐withdrawing groups. This domino process consists of nucleophilic displacement, followed by intramolecular anti‐Michael addition of the preformed allylic isothiourea under mild conditions to give the thiazolidine
Synthesis of allylic thiocyanates and novel 1,3-thiazin-4-ones from 2-(bromomethyl)alkenoates and S-nucleophiles in aqueous medium
作者:Marcus M. Sá、Luciano Fernandes、Misael Ferreira、Adailton J. Bortoluzzi
DOI:10.1016/j.tetlet.2007.12.029
日期:2008.2
Allylic thiocyanates and novel heterocycles containing the 1,3-thiazin-4-one core are easily obtained in high yields and mild conditions by nucleophilic displacement of 2-(bromomethyl)alkenoates (derived from Morita–Baylis–Hillman adducts) with sulphur-centred nucleophiles in aqueous acetone at 25 °C. Treatment of allylic bromides with NaSCN gave the corresponding (Z)-2-(thiocyanomethyl)alkenoates