Synthetic, structural, NMR and catalytic studies of phosphinic amide-phosphoryl chalcogenides (chalcogen = O, S, Se) as mixed-donor bidentate ligands in zinc chemistry
作者:Miguel A. del Águila-Sánchez、Neidemar M. Santos-Bastos、Maria C. Ramalho-Freitas、Jesús García López、Marcos Costa de Souza、Jackson A. L. Camargos-Resende、María Casimiro、Gilberto Alves-Romeiro、María José Iglesias、Fernando López Ortiz
DOI:10.1039/c4dt01789g
日期:——
The molecular structure of the complexes consisted of seven-membered chelates formed by O,X-coordination of the ligands to the zinc cation. The metal is four-coordinated by binding to the two chlorine atoms showing a distorted tetrahedral geometry. Applications in catalysis revealed that hemilabile ligands 20a–c act as significant promoters of the addition of diethylzinc to aldehydes, with 20a showing
邻位取代的(二苯基磷酰基)-,(二苯基磷硫酰基)-和(二苯基磷杂环戊酰基)-次膦酰胺o -C 6 H 4(P(X)Ph 2)(P(O)N i Pr 2)(X = O(20a), S(20b),Se(20c))是通过N,N-二异丙基-P,P-二苯基次膦酰胺(Ph 2 P(O)N i Pr 2)的邻位锂化反应合成的,然后用Ph 2 PCl捕获o的氧化-具有H 2 O 2,S 8和Se的-(二苯基膦)次膦酰胺(19)。新的混合施主二齿配体与二氯化锌的反应提供了相应的配合物[ZnCl 2(P(X)Ph 2)o -C 6 H 4(P(O)N i Pr 2)](21a–c) 。这些新化合物在溶液中通过核磁共振波谱进行了结构表征,并在固体状态下通过对配体(20b)和三种配合物(21a–c)的X射线衍射分析进行了表征。20b的X射线晶体结构提示存在一个P O→P(S)–C分子内非键相互作用。使用DFT方法
Iron-Catalyzed π-Activated C-O Ether Bond Cleavage with C-C and C-H Bond Formation
A novel and efficient allylic alkylation reaction between π-activated ethers and allylsilane was realized under mild conditions through iron(III)-catalyzed C–O ether bond cleavage. The present protocol provides an attractive approach for the construction of sp3–sp3 C–C bonds and can be potentially applied for the selective reduction of benzyl and allyl ethers to their corresponding hydrocarbon compounds
Substituted benzimidazoles and benzopyrazoles as CCR(4) antagonists
申请人:CHEMOCENTRYX, INC.
公开号:US10647696B2
公开(公告)日:2020-05-12
Benzimidazole, benzopyrazole and benzotriazole compounds are provided which bind to CCR(4) and are useful for the treatment of diseases such as allergic diseases, autoimmune diseases, graft rejection and cancer.
Some new oxime ethers of types 7 and 8, in which the methyleneaminoxy group, C=N-O, of oxiconazole 6 is in an inverted atomic sequence, were synthesized and tested for their antifungal activities. Among them, the type 7 compounds, such as the N-ethoxy-morpholino-substituted derivatives 71-o (Table 1), showed good antifungal properties against the Candida strains tested, with minimum inhibitory concentration (MIC) values similar to those of the reference drug 6. A remarkable result was obtained with these types of azoles, which had shown a cidal character against Candida albicans, while the reference drug oxiconazole was only fungistatic in the same tests. This fact may be seen from a comparison of the MIC values with those of the minimum fungicidal concentration (MFC) values for most of the type 7 compounds assayed that have shown differences between the MIC and the MFC, which are lower than three double diluitions. A simple molecular modeling of the P450 14-alpha-sterol demethylase from C. albicans (Candida P450DM) was built in order to understand how the structural differences between type 7 compounds and oxiconazole 6 can induce different antifungal profiles. The results of this work seem to confirm that it is possible to reverse the atomic sequence of the methyleneaminoxy group, C=N-O, of 6, obtaining new imidazoles possessing good antifungal properties.