A facile, green and versatile method for the Boc protection of amines has been developed by a treatment with (Boc)2O without any additive at room temperature. The method is general for the preparation of N-Boc derivatives of aliphatic (acyclic and cyclic), aromatic, and heteroaromatic amines; primary and secondary amines. The advantages of this method are green, simplicity, short reaction times and
<i>N</i>-Salicylideneanilines: Tautomers for Formation of Hydrogen-Bonded Capsules, Clefts, and Chains
作者:Marc Sauer、Charles Yeung、Jonathan H. Chong、Brian O. Patrick、Mark J. MacLachlan
DOI:10.1021/jo052277t
日期:2006.1.1
of new salicylaldimines are reported. Bis(N-salicylideneaniline)s (BSANs) and tris(N-salicylideneaniline)s (TSANs) are sterically encumbered compounds featuring a central six-membered ring in the keto-enamine tautomer. When extended with additional functional groups, these molecules may form hydrogen-bonded capsules, clefts, and extended structures. A TSAN with N-tBOC-o-phenylenediamine groups has been
作者:Lee Belding、Matt Guest、Richard Le Sueur、Travis Dudding
DOI:10.1021/acs.joc.8b00770
日期:2018.6.15
derivatives. Associated with this structural reorganization was an inward gearing of the cyclopropenium ring and twisting of the peri-NMe2 group into coplanarity with the naphthalene ring system. Further, reinforcement of an intramolecular H-bond (IMHB) in the excited state of these derivatives alludes to the importance of photoinduced H-bonding in this new class of cyclopropenium based fluorophores
Synthesis, Theoretical Analysis, and Experimental p<i>K</i><sub>a</sub> Determination of a Fluorescent, Nonsymmetric, In–Out Proton Sponge
作者:Lee Belding、Peter Stoyanov、Travis Dudding
DOI:10.1021/acs.joc.5b01743
日期:2016.1.4
we report the synthesis and theoreticalinvestigation of a nonsymmetric bis(diisopropylamino)cyclopropenimine (DAC)-functionalized proton sponge derivative, coined the “Janus” sponge. The reported sponge was isolated as a monoprotonated salt, though no intramolecularhydrogen bond was observed. Homodesmotic equations supported the absence of a N–HN intramolecularhydrogen bond and a relatively low freebase
本文中,我们报道了非对称的双(二异丙基氨基)环丙炔亚胺(DAC)功能化的质子海绵衍生物的合成和理论研究,即“ Janus”海绵。尽管未观察到分子内氢键,但所报告的海绵被分离为单质子化盐。同渗方程式支持不存在N–HN分子内氢键和相对较低的游离碱应变,而DFT计算和X射线晶体学分析表明,Cl –抗衡离子存在氢键。与此相关的是稀有的碱性氮的进出几何结构,这是质子海绵中第一个这样的例子,它没有正取代基和/或处于质子化状态。此外,N LP发现向环丙烯阳离子中的捐赠稳定了这种空前的进出几何形状。测得的p K a被确定为23.8,与计算值23.9非常吻合。最后,发现Janus海绵在固态和在溶液中均具有荧光性质,这尤其代表了基于环丙炔胺的荧光有机化合物的第一个实例。