Amino Acid-Derived Iodobenzene Dicarboxylates: Reagents for Oxidative Conversion of Alkenes to Amino Acid Esters
摘要:
New amino acid-derived iodobenzene dicarboxylates were prepared by the reaction of (diacetoxyiodo)benzene with N-protected natural amino acids. These compounds in the presence of iodide anion can be used as reagents for beta-iodocarboxylation of alkenes leading to the respective amino acid esters.
A catalyst composed of an organic phosphorus compound having a trivalent or pentavalent phosphorus atom and at least one carbon-phosphorus bonding or a combination of the organic phosphorus compound and a halogen atom-containing compound is effective for decarbonylation, that is, for releasing carbon monoxide from a compound containing a moiety of -CO-CO-O- in its molecular structure.
Dicarbonyl(η-cyclopentadienyl)iron(<scp>II</scp>) derivatives of pentaborane(9)
作者:Norman N. Greenwood、John D. Kennedy、Christopher G. Savory、John Staves、Keith R. Trigwell
DOI:10.1039/dt9780000237
日期:——
2]– which can react with another equivalent of [Fe(η-C5H5)(CO)2I] to give [Fe(η-C5H5)(CO)2}2(2,4-B5H7)](3); this is the first example of a compound with two transition-metal atoms bound to the pentaborane skeleton. Boron-11 and 1H n.m.r. and mass spectroscopic data confirm the structures assigned to (1) and (3); these are consistent with the hypothesis that nido-penta-borate anions act as 2–3-η ligands
所述[B 5 ħ 8 ] -与阴离子反应的[Fe(η-C 5 H ^ 5)(CO)2 I],得到的[Fe(2-B 5 ħ 8)(η-C 5 H ^ 5)(CO)2 ](1)。这可以用KH去质子化,得到阴离子的[Fe(2-B 5 ħ 7)(η-C 5 H ^ 5)(CO)2 ] -它可以与其他等效的[Fe(η-C的反应的5 ħ 5)(CO)2 I],得到[的Fe(η-C 5 H ^ 5)(CO)2} 2(2,4-B 5 H 7)](3);这是在戊硼烷骨架上结合有两个过渡金属原子的化合物的第一个例子。硼11和1 H核磁共振和质谱数据证实了分配给(1)和(3)的结构;这与以下假设相符:在16电子过渡金属化合物中,Nido - penta -borate阴离子充当2–3-η配体,在18电子物种中充当2-σ配体。简要讨论了化合物的电子碰撞片段化。
METHOD FOR PRODUCING ALPHA-ACYLOXYCARBONYL COMPOUND AND NOVEL ALPHA-ACYLOXYCARBONYL COMPOUND
申请人:Ishihara Kazuaki
公开号:US20120323014A1
公开(公告)日:2012-12-20
A method for producing an α-acyloxycarbonyl compound of the present invention includes performing an intermolecular reaction between a carboxylic acid and a carbonyl compound selected from the group consisting of ketones, aldehydes, and esters, which have a hydrogen atom at the α-position, using a hydroperoxide as an oxidizer and an iodide salt as a catalyst precursor, thereby introducing an acyloxy group derived from the carboxylic acid into the α-position of the carbonyl compound.
is driven by a novel activation strategy and features a unique Pd(I)-Pd(I) mechanism, involving an iodide-assisted binuclear step to release the product. This method enables β-selective hydroformylation of a large range of alkenes and alkynes, including sensitive starting materials. Its utility is demonstrated in the synthesis of antiobesity drug Rimonabant and anti-HIV agent PNU-32945. In a broader
[EN] PROCESS FOR PREPARATION OF ALUMINUM SALT OF PHOSPHONIC ACID ESTER<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN SEL D'ALUMINIUM D'UN ESTER D'ACIDE PHOSPHONIQUE
申请人:ICL IP AMERICA INC
公开号:WO2013077989A1
公开(公告)日:2013-05-30
There is provided herein a process for the preparation of aluminum salts of phosphonic acid esters by reacting phosphonic acid diesters with aluminum hydroxide in the presence of a catalyst. The catalyst is selected from the group consisting of a phase transfer catalyst, a thermally stable tertiary amine having a boiling point higher than about 140°C, a thermally stable tertiary phosphine having a boiling point higher than 140°C and combinations thereof. The aluminum phosphonates prepared can be used for making flame retarded thermoplastic polymers.