Pd(<scp>ii</scp>)-catalyzed, controllable C–H mono-/diarylation of aryl tetrazoles: concise synthesis of Losartan
作者:Yan-Jun Ding、Yan Li、Sheng-Yu Dai、Quan Lan、Xi-Sheng Wang
DOI:10.1039/c4ob02453b
日期:——
A palladium(II)-catalyzed C-H arylation directed by tetrazole, a metabolically stable surrogate for the carboxylicacid group in drug design, has been developed. Excellent mono-/di-selectivity was achieved through adjustment of the protecting site on the tetrazole ring. The synthetic utility of this new transformation was demonstrated in the concise total synthesis of Losartan.
Coupling of
<i>N</i>
‐Tosylhydrazones with Tetrazoles: A Regioselective Synthesis of 2,5‐Disubstituted‐2
<i>H</i>
‐Tetrazoles
作者:Tímea Kaszás、Bence Szakács、Éva Juhász‐Tóth、Ivett Cservenyák、Tamara Kovács、László Juhász、László Somsák、Marietta Tóth
DOI:10.1002/ejoc.202201103
日期:2022.11.11
A new regioselectivesynthesis of 2,5-disubstituted-2H-tetrazoles is reported by C−N coupling of N-tosylhydrazones and tetrazoles in the presence of different bases under thermic activation conditions with excellent functional group tolerance.
tetrazole (1,5-Tz) in several cases. The regioselectivities (1,5-Tz:2,5-Tz) are highly variable and cannot be exclusively attributed to the steric hindrance of the electrophile. A new rationale to explain the observed regioselectivity, based on the difference in mechanism between first- and second-order nucleophilic substitutions, is thus proposed. In addition, in some cases the intramolecular stabilization
二取代四唑的合成描述了从 1 H -5-单取代四唑通过脂族胺重氮化反应,形成瞬时烷基重氮中间体,充当烷基化剂。尽管 2,5-二取代四唑 (2,5-Tz) 以中等至极好的收率优先形成,但在几种情况下也可以分离出少量的 1,5-二取代四唑 (1,5-Tz)。区域选择性(1,5-Tz:2,5-Tz)是高度可变的,不能完全归因于亲电试剂的空间位阻。因此,基于一级和二级亲核取代之间的机制差异,提出了解释观察到的区域选择性的新原理。此外,在某些情况下,所得重氮的分子内稳定性会影响区域选择性。
REMEDIES FOR STRESS DISEASES COMPRISING MITOCHONDRIAL BENZODIAZEPINE RECEPTOR ANTAGONISTS
申请人:ONO PHARMACEUTICAL CO., LTD.
公开号:EP1438973A1
公开(公告)日:2004-07-21
A pharmaceutical composition for the prophylaxis and/or treatment of diseases induced, exacerbated or reignited by stressors comprising the compound of formula (I)
wherein all symbols have the same meanings as described in the specification, etc. as an active ingredient.
Remedies for stress diseases comprising mitochondrial benzodiazepine receptor antagonists
申请人:Seko Takuya
公开号:US20050009812A1
公开(公告)日:2005-01-13
A pharmaceutical composition for the prophylaxis and/or treatment of diseases induced, exacerbated or reignited by stressors comprising the compound of formula (I)
wherein all symbols have the same meanings as described in the specification, etc. as an active ingredient.