Cyclometalated Chiral-at-Ruthenium Catalyst for Enantioselective Ring-Closing C(sp<sup>3</sup>)–H Carbene Insertion to Access Chiral Flavanones
作者:Feng Han、Peter H. Choi、Chen-Xi Ye、Yvonne Grell、Xiulan Xie、Sergei I. Ivlev、Shuming Chen、Eric Meggers
DOI:10.1021/acscatal.2c02423
日期:2022.8.19
A competing oxygen attack pathway involving the formation and [1,2]-shift (Stevensrearrangement) of an oxonium ylide intermediate was successfully suppressed in favor of a catalytic enantioselective ring-closing C(sp3)–H carbene insertion. Density functional theory calculations provide a rationale for the observed C–H insertion over the undesirable C–O formation pathway. The method provides access
A novel benzodiazepine derivative represented by general formula (I) or a pharmaceutically acceptable salt thereof. These compounds are useful as medicines, in particular, for treating and preventing diseases in which CCK-B receptor and gastrin receptor participate, because they have CCK-B receptor antagonism, gastrin receptor antagonism and the effect of inhibiting gastric juice secretion.
Synthesis of β-Keto-phosphotriesters Using Functionalized Diazoketones
作者:T. Gefflaut、Jacques Périé
DOI:10.1080/00397919408012621
日期:1994.1
Convenient substitution (Ac) on the heteroatom in diazo ketones as in compounds 6, 8 or 10, prevents the classical cyclisation reaction and allows intermolecular addition; the reaction is applied to phosphorylation (reaction 1).