Synthesis of Homotaurine and 1-Substituted Homotaurines from α,β-Unsaturated Nitriles
作者:Jiaxi Xu、Yunhai Ma
DOI:10.1055/s-0031-1289773
日期:2012.7
an efficient method for the synthesis of 1-substituted homotaurines. Homotaurine and a series of 1-substituted homotaurines were readily synthesized in satisfactory to good yields via the Michael addition of thioacetic acid to aliphatic and aromatic α,β-unsaturatednitriles followed by lithium aluminum hydride mediated reduction and performic acid oxidation. The synthesis of 1,1-disubstituted homotaurines
Manganese(I)-Catalyzed H–P Bond Activation via Metal–Ligand Cooperation
作者:Juana M. Pérez、Roxana Postolache、Marta Castiñeira Reis、Esther G. Sinnema、Denisa Vargová、Folkert de Vries、Edwin Otten、Luo Ge、Syuzanna R. Harutyunyan
DOI:10.1021/jacs.1c10756
日期:2021.12.8
Mn(I) complexes are capable of H–P bond activation. This activation mode enables a general method for the hydrophosphination of internal and terminal α,β-unsaturatednitriles. Metal−ligand cooperation, a strategy previously not considered for catalytic H–P bond activation, is at the base of the mechanistic action of the Mn(I)-based catalyst. Our computational studies support a stepwise mechanism for the
Selective α‐Deuteration of Cinnamonitriles using D
<sub>2</sub>
O as Deuterium Source
作者:Beibei Guo、Johannes G. Vries、Edwin Otten
DOI:10.1002/adsc.202101093
日期:2022.1.4
The selective α-deuteration of α,β-unsaturated nitriles using the strong base tBuOK or a metal-ligand cooperative Ru pincer catalyst is described. With D2O as deuteriumsource and glyme as solvent at 70 °C, tBuOK is an efficient catalyst for deuteration at the α-C(sp2) position of cinnamonitriles, providing access to a broad range of deuterated derivatives in good to excellent yields and with very
描述了使用强碱t BuOK 或金属-配体协同 Ru 钳形催化剂对 α,β-不饱和腈进行选择性 α-氘化。在 70 °C 下以 D 2 O 作为氘源和甘醇二甲醚作为溶剂,t BuOK 是一种有效的肉桂腈α-C( sp 2 ) 位氘化催化剂,可提供从良好到优异的各种氘化衍生物产率和非常高的氘掺入水平。虽然tBuOK 催化的协议不容忍碱敏感的官能团,使用 Milstein 的钌 PNN 钳形催化剂以优异的产率氘化含有苄基溴或酯部分的肉桂腈衍生物。此外,发现金属-配体协同 Ru 催化剂的 H/D 交换活性显着高于t BuOK,即使在室温下也能很好地进行反应。提出了一种机制建议,当使用t BuOK 作为催化剂时,肉桂腈 α-CH 位置的去质子化,而与 Ru PNN 钳子的 H/D 交换催化可能通过(可逆的)Oxa-Michael 加成 D 2 O 进行。
Oxadiazole and oxadiazoline derivatives
申请人:Glaxo Laboratories Limited
公开号:US04012377A1
公开(公告)日:1977-03-15
There are described new compounds of formula ##STR1## in which E is selected from the group consisting of residues of formula ##STR2## in which R" is selected from the group consisting of amino, vinyl, allyl, ethynyl, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy, or C.sub.1 -C.sub.5 alkylthio or a C.sub.1 -C.sub.5 alkyl group susbstituted by at least one halogen atom; and hydrogen; in which R.sup.1 and R.sup.2 are each selected from the group consisting of hydrogen, halogen, methyl and ethyl; and R' is selected from substituted phenyl when R" is other than hydrogen, and phenyl, thienyl and substituted phenyl and thienyl when R" is hydrogen. The compounds are useful in the control of parasites. Certain of the compounds have antimicrobial properties.
The present invention features compounds able to modulate one or more activities of an inorganic ion receptor and methods for treating diseases or disorders by modulating inorganic ion receptor activity. Preferably, the compound can mimic or block the effect of extracellular Ca2+ on a calcium receptor.