N-保护的2,4-二取代-1,5-苯并二氮杂和二苯并[1,5]氧杂/硫氮杂的铱催化高度立体选择性转移氢化在酸性条件下在水溶剂中实现,甲酸为氢化物供体。在与非对映选择性问题相关的所有情况下,仅获得反式产物。催化剂效率高度依赖于基材的电子和空间特性。拓扑分析氢化物传递的攻角显示,立体电子学上,N-保护基团和空间大的氢化铱中间体之间的空间相互作用构成了出色的立体化学控制的主要贡献者。使用 DCO 2也可以获得高度氘代产品D 作为氘化物供体。观察到的主要动力学同位素效应(k H / k D = 4.24)表明通过β-氢化物消除形成氢化铱应该是速率决定步骤(C-H键断裂)。还从概念上证明了手性修饰的铱催化剂在外消旋 1,5-苯二氮卓类化合物的化学拆分中的潜在用途。
New access to the one-pot solvent-free synthesis of 4,5-dihydro-pyrido[2,3-<i>b</i>][1,4]diazepines and 2,3-dihydro-benzo[<i>b</i>][1,4]diazepines by microwave irradiation
作者:Shyamaprosad Goswami、Anita Hazra、Subrata Jana
DOI:10.1002/jhet.148
日期:2009.9
pyridodiazepines and benzodiazepines have been synthesized in solvent and catalyst free microwave condition from aryl/heteroaryl diamines and β-aryl vinyl ketones. The yields of the reactions varied with the substituents attached to the aryl/heteroaryl diamines. This common protocol is equally effective for the synthesis of pyridodiazepines and benzodiazepines with pharmacological interest, though in case
Construction of the 1,5-Benzodiazepine Skeleton from <i>o</i>-Phenylendiamine and Propargylic Alcohols via a Domino Gold-Catalyzed Hydroamination/Cyclization Process
The gold-catalyzed reaction of o-phenylendiamine with propargylic alcohols affords 1,5-benzodiazepines bearing different substituents on the 2 and 4 positions. The method allows even for the selective preparation of 4-substituted 1,5-benzodiazepine derivatives.
Iridium-Catalyzed Stereoselective Transfer Hydrogenation of 1,5-Benzodiazepines
作者:Changmeng Liu、Yang Chen、Zhanhui Yang
DOI:10.1021/acs.joc.2c01006
日期:2022.9.16
the angle of attack for hydride delivering revealed, stereoelectronically, that the steric interaction between the N-protecting group and the sterically large iridium hydride intermediate constitutes the main contributor to the excellent stereochemical control. Highly deuterated products can also be accessible with DCO2D as the deuteride donor. The observed primary kinetic isotope effect (kH/kD = 4
N-保护的2,4-二取代-1,5-苯并二氮杂和二苯并[1,5]氧杂/硫氮杂的铱催化高度立体选择性转移氢化在酸性条件下在水溶剂中实现,甲酸为氢化物供体。在与非对映选择性问题相关的所有情况下,仅获得反式产物。催化剂效率高度依赖于基材的电子和空间特性。拓扑分析氢化物传递的攻角显示,立体电子学上,N-保护基团和空间大的氢化铱中间体之间的空间相互作用构成了出色的立体化学控制的主要贡献者。使用 DCO 2也可以获得高度氘代产品D 作为氘化物供体。观察到的主要动力学同位素效应(k H / k D = 4.24)表明通过β-氢化物消除形成氢化铱应该是速率决定步骤(C-H键断裂)。还从概念上证明了手性修饰的铱催化剂在外消旋 1,5-苯二氮卓类化合物的化学拆分中的潜在用途。