35660-94-7Relevant articles and documents
A BULKY LIGAND AND ITS ORGANOMETALLIC COMPOUND: SYNTHESIS OF HEPTAMETHYLINDENE AND A FERROCENE-TYPE COMPLEX, Fe(η5-C9Me7)2
Miyamoto, T. Ken,Tsutsui, Minoru,Chen, Li-Ban
, p. 729 - 730 (1981)
A bulky new indene, 1-H-1,2,3,4,5,6,7-heptamethylindene, has been synthesized and its application to organometallic chemistry is suggested.
Chemo- and Regioselective Functionalization of Nortrilobolide: Application for Semisynthesis of the Natural Product 2-Acetoxytrilobolide
Doan, Nhu Thi Quynh,Crestey, Fran?ois,Olsen, Carl Erik,Christensen, S?ren Br?gger
, p. 1406 - 1414 (2015)
The difference in reactivity of the hexaoxygenated natural product thapsigargin (1) and the pentaoxygenated nortrilobolide (3) was compared in order to develop a chemo- and regioselective method for the conversion of nortrilobolide (3) into the natural product 2-acetoxytrilobolide (4). For the first time, a stereoselective synthesis of 2-acetoxytrilobolide (4) is described, which involves two key reactions: the first chemical step was a one-pot substitution-oxidation reaction of an allylic ester into its corresponding α,β-unsaturated ketone. The second process consisted of a stereoselective α′-acyloxylation of the key intermediate α,β-unsaturated ketone to afford its corresponding acetoxyketone, which was converted into 2-acetoxytrilobolide (4) in a few steps. This innovative approach would allow the synthesis of a broad library of novel and valuable penta- and hexaoxygenated guaianolides as potential anticancer agents.
Synthesis, characterisation, and polymerisation studies of hexamethylindenyl zirconocenes and hafnocenes
Arnold, Thomas A.Q.,Buffet, Jean-Charles,Turner, Zo? R.,O'Hare, Dermot
, p. 55 - 65 (2015)
Abstract A family of group 4 metallocene complexes based on the hexamethylindenyl ligand (C9Me6H; Ind#) have been prepared and fully characterised. The complexes rac-Ind#2ZrCl2 (rac-1), meso-Ind#2ZrCl2 (meso-1), rac-Ind#2HfCl2 (rac-2), meso-Ind#2HfCl2 (meso-2) were prepared by the reaction of Ind#Li with the corresponding MCl4 (where M = Zr, Hf); and rac-Ind#2Zr(CH2Ph)2 (rac-3) was derived from rac-1 using two equivalents of potassium benzyl (KCH2Ph). All five species were characterised by NMR spectroscopy, single crystal X-ray diffraction and studied using density functional theory. The zirconocenes were tested for their activity as solution-phase ethylene polymerisation catalysts and rac-1 was found to outperform the meso-1 at most temperatures. The benzyl analogue, rac-3, peaked at more than double the activity reported for the dihalide species.
Chemistry of renieramycins. Part 14: Total synthesis of renieramycin i and practical synthesis of cribrostatin 4 (renieramycin H)
Yokoya, Masashi,Kobayashi, Keiichiro,Sato, Mitsuhiro,Saito, Naoki
, p. 4915 - 4933 (2015)
The first total synthesis of (±)-renieramycin I, which was isolated from the Indian bright blue sponge Haliclona cribricutis, is described. The key step is the selenium oxide oxidation of pentacyclic bis-p-quinone derivative (3) stereo- and regioselectively. We also report a large-scale synthesis of cribrostatin 4 (renieramycin H) via the C3-C4 double bond formation in an early stage based on the Avenda?o's protocol, from readily available 1-acetyl-3-(3-methyl-2,4,5-trimethylphenyl)methyl-piperazine-2,5-dione (8) in 18 steps (8.3% overall yield). The synthesis provides unambiguous evidence supporting the original structure of renieramycin I.
RhIII-Catalyzed C-H (Het)arylation/Vinylation of N-2,6-Difluoroaryl Acrylamides
Wang, Huai-Wei,Qiao, Yu-Han,Wu, Jia-Xue,Wang, Qiu-Ping,Tian, Meng-Xin,Li, Yong-Fei,Yao, Qing-Xia,Li, Da-Cheng,Dou, Jian-Min,Lu, Yi
supporting information, p. 656 - 662 (2021/02/01)
RhIII-catalyzed sp2 C-H cross-coupling of acrylamides with organoboron reactants has been accomplished using a commercially available N-2,6-difluoroaryl acrylamide auxiliary. A broad range of aryl and vinyl boronates as well as a variety of heterocyclic boronates with strong coordinating ability can serve as the coupling partners. This transformation proceeds under moderate reaction conditions with excellent functional group tolerance and high regioselectivity.
Erratum: Synthetic Studies on Selective, Proapoptotic Isomalabaricane Triterpenoids Aided by Computational Techniques (J. Am. Chem. Soc. (2021) 143:4 (2138-2155) DOI: 10.1021/jacs.0c12569)
Boyko, Yaroslav D.,Chu, Tiffany,Hergenrother, Paul J.,Huck, Christopher J.,Ning, Shang,Sarlah, David,Shved, Alexander S.,Tonogai, Emily J.,Yang, Cheng
supporting information, p. 12418 - 12418 (2021/08/30)
Figure 2c and the accompanying text on page 2140, as well as the SI, mistakenly stated the use of AD-mix-a. AD-mix- ? was used for the transformation from 11 to (+)-13. All structures drawn are correct, and all conclusions remain the same. A revised Supporting Information document that reflects this correction is also available.
Stereospecific Electrophilic Fluorocyclization of α,β-Unsaturated Amides with Selectfluor
Fei, Haiyang,Fu, Yao,Jalani, Hitesh B.,Li, Guigen,Lu, Hongjian,Wu, Hongmiao,Xu, Zheyuan,Zhu, Lin
supporting information, (2020/03/30)
An efficient fluorocyclization of α,β-unsaturated amides through a formal halocyclization process is developed. The reaction proceeds under transition-metal-free conditions and leads to the formation of fluorinated oxazolidine-2,4-diones with excellent regio- and diastereoselectivity. The evaluation of the reaction mechanism based on preliminary experiments and density functional theory calculations suggests that a synergetic syn-oxo-fluorination occurs and is followed by an anti-oxo substitution reaction. The reaction opens a new window in the field of stereospecific fluorofunctionalization.