Aerobic Dehydrogenation of
<i>N</i>
‐Heterocycles with Grubbs Catalyst: Its Application to Assisted‐Tandem Catalysis to Construct
<i>N</i>
‐Containing Fused Heteroarenes
catalyst is developed. The reaction is applicable to various nitrogen‐containing heterocycles. The exceptionally high functional group compatibility of this method was confirmed by the oxidation of an unprotected dihydroindolactam V to indolactam V. Furthermore, by taking advantage of the oxygen‐mediated structural change of the Grubbs catalyst, we integrated ring‐closing metathesis and subsequent aerobic
structural motifs such as C-2 and C-3 substitutions (alkyl or aryl), cis/trans relative stereochemistry and functionalization of the aromatic ring (fluoro, methyl or methoxygroups) have been efficiently prepared through Fischerindolization and subsequent diastereoselective reduction of the unprotected indoles. Combination of Candida antarctica lipase type A and allyl 3-methoxyphenyl carbonate has been
Disclosed are benzylpiperazinyl-indolinylethanone compounds which are useful for the treatment and/or prevention of neuropsychological disorders including, but not limited to, schizophrenia, mania, dementia, depression, anxiety, compulsive behavior, substance abuse, Parkinson-like motor disorders and motion disorders related to the use of neuroleptic agents. Pharmaceutical compositions, including packaged pharmaceutical compositions, are further provided. Compounds of the invention are also useful as probes for the localization of GABAA receptors in tissue samples.
Asymmetric Hydrogenation of Unprotected Indoles Catalyzed by η<sup>6</sup>-Arene/<i>N</i>-Me-sulfonyldiamine–Ru(II) Complexes
作者:Taichiro Touge、Takayoshi Arai
DOI:10.1021/jacs.6b06295
日期:2016.9.7
Protecting-group-free transformation is a challenging and important issue in atom-economical organic synthesis. The η(6)-arene/N-Me-sulfonyldiamine-Ru(II)-BF4 complex-catalyzed asymmetric hydrogenation of 2-substituted unprotected indoles in weakly acidic hexafluoroisopropanol gives optically active indoline compounds with up to >99% ee. Under mild reaction media, halogen atoms and synthetically important
无保护基团转化是原子经济有机合成中一个具有挑战性和重要的问题。η(6)-芳烃/N-Me-磺酰二胺-Ru(II)-BF4 配合物催化2-取代的未保护吲哚在弱酸性六氟异丙醇中的不对称氢化得到具有高达>99% ee 的旋光二氢吲哚化合物。在温和的反应介质下,吲哚上的卤素原子和合成上重要的保护基团(例如甲硅烷基醚、缩醛、苄基醚和酯)得以保留,这有利于进一步合成复杂的二氢吲哚分子。
Heterogeneous Catalytic Hydrogenation of Unprotected Indoles in Water: A Green Solution to a Long-Standing Challenge
作者:Aditya Kulkarni、Weihong Zhou、Béla Török
DOI:10.1021/ol2019899
日期:2011.10.7
An environmentally benign procedure for the hydrogenation of unprotected indoles is described. The hydrogenation reaction is catalyzed by Pt/C and activated by p-toluenesulfonic acid in water as a solvent. The efficacy of the method is illustrated by the hydrogenation of a variety of substituted indoles to their corresponding indolines which were obtained in excellent yields.