Synthesis of 2,3-Disubstituted Pyrrolidines and Piperidines via One-Pot Oxidative Decarboxylation−β-Iodination of Amino Acids
作者:Alicia Boto、Rosendo Hernández、Yolanda de León、Ernesto Suárez
DOI:10.1021/jo015877a
日期:2001.11.1
of the solvent and the ring size of the starting amino acid are studied, as well as the nature of the protecting group on the nitrogen. The stereoselectivity of the reaction was also studied using chiral methyl (2S,4S)-4-acetyloxyproline-1-carboxylate (8). The products obtained can be manipulated to give bicyclic systems present in many natural products. By using the tandem decarboxylation-iodination-alkylation
Oxidative decar☐ylation of α-amino acids: A mild and efficient method for the generation ofN-acyliminium ions
作者:Alicia Boto、Rosendo Herna´ndez、Ernesto Sua´rez
DOI:10.1016/s0040-4039(99)01180-6
日期:1999.8
The oxidative decar☐ylation of α-amino acids using the system (diacetoxyiodo)benzene or iodosylbenzene and iodine proceeded smoothly at room temperature. The intermediacy of anN-acyliminium cation has been demonstrated through intermolecular and intramolecular trapping with nucleophiles.
[EN] A NOVEL PROCESS FOR THE PREPARATION OF SITAGLIPTIN<br/>[FR] NOUVEAU PROCÉDÉ DE PRÉPARATION DE SITAGLIPTINE
申请人:SMILAX LAB LTD
公开号:WO2013114173A1
公开(公告)日:2013-08-08
The present invention is directed to a process for the preparation of enantiomerically enriched β-amino acid derivatives which are important chiral building blocks and intermediates in pharmaceuticals. More specifically, the invention pertains to a novel process for practically convenient and economically producing enantiomerically enriched β-amino acid derivatives which are useful for the synthesis of amide inhibitors of dipeptidyl peptidase IV like Sitagliptin, which have been used to treat type 2 diabetes.
AMINO GROUP-CONTAINING CONJUGATED DIENE POLYMER AND METHOD FOR PRODUCING THE SAME, AND BLOCK COPOLYMER AND METHOD FOR PRODUCING THE SAME
申请人:Kura Satoshi
公开号:US20100267918A1
公开(公告)日:2010-10-21
A method for producing an amino group-containing conjugated diene polymer includes polymerizing a conjugated diene compound in the presence of a reaction product of 1,3-bis(diphenylethenyl)benzene or a derivative thereof and an organolithium compound to obtain a conjugated diene polymer, and reacting the conjugated diene polymer with a modifier.
Photostable Ruthenium(II) Isocyanoborato Luminophores and Their Use in Energy Transfer and Photoredox Catalysis
作者:Lucius Schmid、Christoph Kerzig、Alessandro Prescimone、Oliver S. Wenger
DOI:10.1021/jacsau.1c00137
日期:2021.6.28
challenging energy transfer catalysis as well as oxidative and reductive photoredox catalysis. B(C6F5)3 groups attached to the CN– ligands stabilize the metal-based t2g-like orbitals by ∼0.8 eV, leading to high 3MLCT energies (up to 2.50 eV) that are more typical for cyclometalated iridium(III) complexes. Through variation of their α-diimine ligands, nonradiative excited-state relaxation pathways involving
钌(II)多吡啶配合物是光催化中最受欢迎的敏化剂之一,但它们在可获得的激发态能量和光稳定性方面面临一些严重的限制,这可能会阻碍未来的应用。在这项研究中,杂配钌 (II) 氰化物配合物与 α-二亚胺辅助配体的硼酸化被确定为一个有用的概念,可提高光活性金属到配体电荷转移 (MLCT) 状态的能量并获得异常光强的化合物适用于具有挑战性的热力学能量转移催化以及氧化和还原光氧化还原催化。B(C 6 F 5 ) 3基团连接到 CN –配体稳定金属基 t 2g-类似轨道约 0.8 eV,导致高3MLCT 能量(高达 2.50 eV)对于环金属化铱 (III) 配合物更为典型。通过改变它们的 α-二亚胺配体,可以控制涉及更高位金属中心态的非辐射激发态弛豫途径,并且可以优化它们的发光量子产率和 MLCT 寿命。由于缺乏足够的三线态能量或激发态氧化还原能力,这些组合的特性使相应的异氰基硼酸络合物易于进行光化学反应,而普通的基于钌