Hydantoin nucleosides were synthesized from a protected methyl 2-deoXy-D-ribofuranoside in a Friedel-Crafts catalyzed silyl-Hilbert-Johnson reaction as modified by Vorbruggen. Atypical byproducts are accounted for by assuming the initial step being a ring opening of the sugar to give an acyclic glycos-1-yl cation.
A New Approach for the Conversion of Thiohydantoin to Hydantoin Derivatives
摘要:
The reaction of thiohydantoins with 1-(bromo-acetyl)benzenes afforded the corresponding hydantoin derivatives and 1-(mercaptoacetyl)benzenes instead of the expected oxoimidazothiazoles.
Photopolymerizable diepoxides containing a nitrogen heterocycle
申请人:Ciba-Geigy Corporation
公开号:US04124760A1
公开(公告)日:1978-11-07
Diepoxides which may be photopolymerized in the presence or absence of a photosensitizer contain a group having conjugated unsaturation attached to a nitrogen heterocycle, such as a hydantoin or barbituric acid residue, forming part of an advanced diepoxide. The resultant photopolymer may be crosslinked by heating in the presence of a curing agent for epoxide resins. The diepoxides are of use in the production of printing plates and printed circuits, especially multilayer printed circuits.
Privileged Scaffolds or Promiscuous Binders: A Comparative Study on Rhodanines and Related Heterocycles in Medicinal Chemistry
作者:Thomas Mendgen、Christian Steuer、Christian D. Klein
DOI:10.1021/jm201243p
日期:2012.1.26
campaigns, we decided to perform a systematic study on their promiscuity. An amount of 163 rhodanines, hydantoins, thiohydantoins, and thiazolidinediones were synthesized and tested against several targets. The compounds were also characterized with respect to aggregation and electrophilic reactivity, and the binding modes of rhodanines and relatedcompounds in published X-ray cocrystal structures were analyzed
作者:José M. Fraile、Gustavo Lafuente、José A. Mayoral、Antonio Pallarés
DOI:10.1016/j.tet.2011.09.034
日期:2011.11
derivatives, can be obtained by different synthetic routes. These compounds can undergo a large variety of reactions, such as Diels–Alder, epoxidation, methanol addition and conjugate addition reactions of different types of nucleophiles, including carbon (cyanide), nitrogen (piperidine) and sulfur (thiols, thioacetate) nucleophiles. The reactivity with electrophilic reagents, such as m-CPBA or methanol
Design and Tuning of Photoswitches for Solar Energy Storage
作者:Raul Losantos、Diego Sampedro
DOI:10.3390/molecules26133796
日期:——
increase the energy difference between isomers and to tune the absorption spectrum. The inclusion of a mechanical lock in the structure, via an alkyl chain and the presence of a hydrogen bonding are shown to directly influence the energy difference and the absorptionspectra. Results shown here prove that these two approaches could be relevant for the design of newcompounds with improved performance for
当前的能源需求迫使探索化石燃料以外的替代能源。分子太阳能热 (MOST) 系统已被提议作为一种适用于太阳能使用和储存的技术。用于此应用的化合物需要满足一系列要求,即吸收阳光和储存的一些最关键的能量。在本文中,我们从其作为 MOST 的潜在用途的角度研究了不同家族的知名分子光开关。从基本结构开始,我们使用密度泛函理论 (DFT) 计算模型提出两种不同的策略来增加异构体之间的能量差异并调整吸收光谱。在结构中加入机械锁,显示通过烷基链和氢键的存在直接影响能量差和吸收光谱。此处显示的结果证明,这两种方法可能与设计具有更高性能的 MOST 应用的新化合物相关。
Enantioselective Synthesis of Chiral Substituted 2,4-Diketoimidazolidines and 2,5-Diketopiperazines via Asymmetric Hydrogenation
An enantioselective hydrogenation of 5-alkylidene-2,4-diketoimidazolidines (hydantoins) and 3-alkylidene-2,5-ketopiperazines catalyzed by the Rh/f-spiroPhos complex under mild conditions has been developed, which provides an efficientapproach to the highly enantioselective synthesis of chiral hydantoins and 2,5-ketopiperazine derivatives with high enantioselectivities up to 99.9% ee.
已经开发了在温和条件下由 Rh/ f -spiroPhos 络合物催化的 5-亚烷基-2,4-二酮咪唑烷(乙内酰脲)和 3-亚烷基-2,5-酮哌嗪的对映选择性氢化,这提供了一种高效的方法。手性乙内酰脲和 2,5-酮哌嗪衍生物的对映选择性合成,对映选择性高达 99.9% ee。