an isopropyl or cyclopropyl group at the 2 position of the indolizine are among the most potent calciumantagonists known outside the 1,4-dihydropyridine series. The IC50 values for the inhibition of [3H]nitrendipine binding vary between 0.19 and 4.5 nM whereas the IC50 value for nifedipine is 2.5 nM. One of the compounds in this group (9ab) has now been selected for clinical development.
Stenlake; Waigh; Urwin, European Journal of Medicinal Chemistry, 1981, vol. 16, # 6, p. 503 - 507
作者:Stenlake、Waigh、Urwin、et al.
DOI:——
日期:——
Catalyst Evolution in Ruthenium-Catalyzed Coupling of Amines and Alcohols
作者:Valeriy Cherepakhin、Travis J. Williams
DOI:10.1021/acscatal.9b03679
日期:2020.1.3
catalyst evolution for our ruthenium-based coupling of amines and alcohols, which proceeds from a [(η6-cymene)RuCl(PyCH2PtBu2)]OTf (1) precatalyst. The method selectively produces secondary amines through a hydrogen borrowing mechanism and is successfully applied to several heterocyclic carbinol substrates. Under the reaction conditions, precatalyst 1 evolves through a series of catalytic intermediates:
我们描述了机构,范围,和用于胺和醇的我们的基于钌的耦合,其中从[(η前进催化剂进化6 -cymene)的RuCl(PyCH 2 P吨卜2)]光学传递函数(1)预催化剂。该方法通过氢借位机理选择性地产生仲胺,并成功地应用于几种杂环甲醇底物。在反应条件下,预催化剂1周的演进通过一系列催化中间体:[(η 6 -cymene)期RuH(PyCH 2 P吨卜2)]光学传递函数(3),的[Ru 3 ħ 2氯2(CO)(PyCH 2 P t Bu 2)2 μ-(C 5 H 3 N)CH 2 P t Bu 2 }] OTf(4)和[Ru 2 HCl(CO)2(PyCH 2 P吨卜2)2(μ-O 2 C ^ ñ PR)] X(反式- 5,X =氯;顺式- 6,X = OTF)。4和6的结构通过单晶X射线衍射确定。对催化活性的研究表明,4是催化剂的休眠(但活着)形式,而5和6是最终的死形式。电化学研究表明,4在CH