The Cu‐catalyzed Ullmann‐Goldberg cross‐coupling between aryl iodides and oxamates is shown to afford the corresponding N‐aryloxamates with yields ranging from moderate to excellent, when the oxamate precursor incorporates a bulky tertiary alkyl group effectively preventing product degradation under the strongly basic reaction conditions. The final oxamic acids are then generated through the acid hydrolysis of the oxamate in high yields. These acids were then converted into urethanes using PIDA under thermal conditions or a visible‐light Fe‐LMCT process. While electron‐deficient N‐aryl oxamic acids provide urethanes with high efficiencies, electron‐rich counterparts led to diminished yields due to aryl group over‐oxidation induced by PIDA.
A continuous flow synthesis of [1.1.1]propellane and bicyclo[1.1.1]pentane derivatives
作者:Kian Donnelly、Marcus Baumann
DOI:10.1039/d0cc08124h
日期:——
generate [1.1.1]propellane on demand is presented rendering solutions of [1.1.1]propellane that can directly be derivatised into various bicyclo[1.1.1]pentane (BCP) species. This was realised in throughputs up to 8.5 mmol h−1 providing an attractive and straightforward access to gram quantities of selected BCP building blocks. Lastly, a continuous photochemical transformation of [1.1.1]propellane into valuable
提出了一种按需产生[1.1.1]丙炔的连续流动过程,提出了可直接衍生为各种双环[1.1.1]戊烷(BCP)物种的[1.1.1]丙炔溶液。在高达8.5 mmol h -1的通量中实现了这一目标,从而提供了对克量的所选BCP构建基块的吸引力和直接访问。最后,开发了一种持续的光化学转化方法,将[1.1.1]丙炔转化为带有混合的酯/酰氯部分的有价值的BCP。
Metal‐Free, Light‐Mediated, Site‐Specific, Radical C6−H Alkylation of Purines with Alcohols Intervened by Oxalates without Catalysts
A mild and practical protocol for highly regioselective C6−Halkylation of purines with alcoholsintervened by oxalates under blue LED irradiation is reported. This transformation does not need transition metalcatalysts, is not sensitive to moisture and does not require N2 protection. Besides, this method displays broad functional groups compatibility and is easily scale up.
报告了一种温和实用的方案,用于在蓝色 LED 照射下草酸盐干预嘌呤与醇的高度区域选择性 C6-H 烷基化。这种转化不需要过渡金属催化剂,对水分不敏感,也不需要N 2保护。此外,该方法显示出广泛的功能组兼容性并且易于放大。
Novel peroxyoxalates derived from hydroxy-hydroperoxides
申请人:ELF ATOCHEM NORTH AMERICA, INC.
公开号:EP0850928A1
公开(公告)日:1998-07-01
Novel peroxyoxalate compositions of Structure A,
and use of the novel monoperoxyoxalates of Structure A as initiators for polymerizing ethylenically unsaturated monomers and for curing of unsaturated polyester resins are disclosed.
结构 A 的新型过氧化物缩醛组合物、
公开了结构 A 的新型单过氧化物歧化物作为乙烯基不饱和单体聚合和不饱和聚酯树脂固化的引发剂的用途。
Novel oxalic acid peroxide compositions and uses
申请人:ELF ATOCHEM NORTH AMERICA, INC.
公开号:EP0850927A1
公开(公告)日:1998-07-01
A novel peroxide composition of Structure A,
and use of the novel oxalic acid peroxide composition of Structure A as an initiator; a) for curing of unsaturated polyester resins, b) for polymerizing ethylenically unsaturated monomers, c) for crosslinking of polyolefins, d) for curing of elastomers, e) for modifying polyolefins, f) for grafting of vinyl monomers onto polymer backbones and g) for compatibilizing blends of two or more incompatible polymers are disclosed.
结构 A 的新型过氧化物组合物
结构 A 的新型草酸过氧化物组合物作为引发剂;a) 用于不饱和聚酯树脂的固化;b) 用于乙烯基不饱和单体的聚合;c) 用于聚烯烃的交联;d) 用于弹性体的固化;e) 用于聚烯烃的改性;f) 用于乙烯基单体在聚合物骨架上的接枝;g) 用于两种或两种以上不相容聚合物混合物的相容。
Analogues of the Herbicide, <i>N</i>-Hydroxy-<i>N</i>-isopropyloxamate, Inhibit <i>Mycobacterium tuberculosis</i> Ketol-Acid Reductoisomerase and Their Prodrugs Are Promising Anti-TB Drug Leads
作者:Ajit Kandale、Khushboo Patel、Waleed M. Hussein、Shun Jie Wun、Shan Zheng、Lendl Tan、Nicholas P. West、Gerhard Schenk、Luke W. Guddat、Ross P. McGeary