Facile, One-Step Production of Niacin (Vitamin B3) and Other Nitrogen-Containing Pharmaceutical Chemicals with a Single-Site Heterogeneous Catalyst
作者:Robert Raja、John Meurig Thomas、Michael Greenhill-Hooper、Steven V. Ley、Filipe A. Almeida Paz
DOI:10.1002/chem.200701679
日期:2008.3.7
Niacin (3-picolinic acid), which is extensively used as vitaminB3 in foodstuffs and as a cholesterol-lowering agent, along with other oxygenated products of the picolines, 4-methylquinoline, and a variety of pyrimidines and pyridazines, may be produced in a single-step, environmentally benign fashion by combining single-site, open-structure, heterogeneouscatalysts with a solid source of active oxygen
Synthesis of heteroaryl amines has been an important topic in organic chemistry because of their importance in small-molecule discovery. In particular, 2-aminopyrimidines represent a highlyprivilegedstructuralmotif that is prevalent in bioactive molecules, but a general strategy to introduce the pyrimidine C2–N bonds via direct functionalization is elusive. Here we describe a synthetic platform
Transition metal-free regioselective cross-coupling of azine N-oxides with cymantrenyl lithium
作者:Alexandra A. Musikhina、Irina A. Utepova、Oleg N. Chupakhin、Valery N. Charushin、Pavel A. Slepukhin
DOI:10.1016/j.jorganchem.2018.06.008
日期:2018.9
The facile CC coupling reaction of activated forms of azaaromatics (azine-N-oxides) with cymantrenyl lithium, as a nucleophile, has first been carried out. It has been established that aromatization of intermediate adducts can be realized through either oxidative or eliminative pathways, depending on the structure of the starting azine N-oxide. In particular, the dihydroazinyl intermediates, bearing
The versatility of non-heme diiron monooxygenase PmlABCDEF: a single biocatalyst for a plethora of oxygenation reactions
作者:Vytautas Petkevičius、Justas Vaitekūnas、Mikas Sadauskas、Fabian Peter Josef Schultes、Dirk Tischler、Rolandas Meškys
DOI:10.1039/d2cy01167k
日期:——
(such as styrenes and allylic ethers) produced epoxide derivatives (oxiranes). Highly valued compounds including benzyl glycidyl ether and phenyl glycidyl ether were prepared with pronounced enantiomeric excess – 93% and 77% respectively. Phenolic compounds underwent ortho-directed aromatic ring hydroxylation reactions, yielding catechol derivatives such as 3-methylcatechol, 3-ethylcatechol, and 3-chlorocatechol
在本文中,我们讨论了非血红素二铁单加氧酶 PmlABCDEF 及其突变体在各种不同氧化反应中的应用。带有 PmlABCDEF 单加氧酶及其变体的恶臭假单胞菌KT2440的全细胞被证明是用于环羟基化、杂原子氧化和 C C 键功能化的多功能生物催化剂。N-杂芳族化合物如吡啶、吡嗪和嘧啶被转化为相应的N-氧化物在高底物负载下,在一些情况下,具有良好的区域选择性。芳族硫醚转化为亚砜作为反应的主要产物。吲哚的生物氧化导致靛蓝色素的形成,即靛蓝衍生物。用含有双键的取代基(如苯乙烯和烯丙基醚)的芳族化合物转化产生环氧化物衍生物(环氧乙烷)。制备高价值的化合物,包括苄基缩水甘油醚和苯基缩水甘油醚,对映体明显过量——分别为 93% 和 77%。酚类化合物经过邻位-定向芳环羟基化反应,产生儿茶酚衍生物,例如 3-甲基儿茶酚、3-乙基儿茶酚和 3-氯儿茶酚。总体而言,我们证明了 (1) PmlABCDEF 单加
Ochiai; Yamanaka, Pharmaceutical Bulletin, 1955, vol. 3, p. 175,176