通过1 H NMR滴定确定环己基邻苯二甲酰亚胺2和金刚烷基邻苯二甲酰亚胺3与β-环糊精(β-CD)的包合物的稳定性常数,分别为K = 190±50 M -1和K = 2600±600 M -1。研究了包合物2 @β-CD和3 @β-CD的光化学反应性,发现β-CD不会影响脱羧效率,但会影响后续的光化学H吸收,导致产物分布不同在β-CD存在下照射。与丙烯腈(AN)和三元配合物的形成还通过1 H NMR提出了2β-CD或3β -CD。尽管建议形成这种配合物,但无法确定稳定性常数。在形成环加合物7的水溶液中,在存在AN的情况下,对2β-CD的辐照高度表明在三元络合物中发生了脱羧和[3 + 2]环加成反应,而由大体积的金刚烷3发生这种反应的可能性较小。可以在β-CD腔中进行脱羧和环加成的这一原理证明对于设计用于控制光反应性的新超分子系统具有重要意义。
通过1 H NMR滴定确定环己基邻苯二甲酰亚胺2和金刚烷基邻苯二甲酰亚胺3与β-环糊精(β-CD)的包合物的稳定性常数,分别为K = 190±50 M -1和K = 2600±600 M -1。研究了包合物2 @β-CD和3 @β-CD的光化学反应性,发现β-CD不会影响脱羧效率,但会影响后续的光化学H吸收,导致产物分布不同在β-CD存在下照射。与丙烯腈(AN)和三元配合物的形成还通过1 H NMR提出了2β-CD或3β -CD。尽管建议形成这种配合物,但无法确定稳定性常数。在形成环加合物7的水溶液中,在存在AN的情况下,对2β-CD的辐照高度表明在三元络合物中发生了脱羧和[3 + 2]环加成反应,而由大体积的金刚烷3发生这种反应的可能性较小。可以在β-CD腔中进行脱羧和环加成的这一原理证明对于设计用于控制光反应性的新超分子系统具有重要意义。
Development of Modifiable Bidentate Amino Oxazoline Directing Group for Pd-Catalyzed Arylation of Secondary CH Bonds
作者:Kang Chen、Zhao-Wei Li、Peng-Xiang Shen、Hong-Wei Zhao、Zhang-Jie Shi
DOI:10.1002/chem.201406528
日期:2015.5.11
A novel bidentate α‐amino oxazolinyl directinggroup has been developed. Different from previous directinggroups, this newly designed directinggroup was easily prepared from amino acids and modified in structure. This auxiliary preferentially effects functionalization at secondaryC(sp3)Hbonds, rather than at aryl C(sp2)Hbonds. The diastereoselectivity of directarylation between geminal secondary
Cyclic α-amino acids as precursors for synthesis of 2-amino-3-hetarylpyrrolin-4-ones and their spiro derivatives
作者:Alexey V. Dobrydnev、Tatyana A. Volovnenko、Yulian M. Volovenko、Gennady V. Palamarchuk、Oleg V. Shishkin
DOI:10.1007/s00706-012-0727-3
日期:2012.5
Abstractα-Aminoisobutanoic acid and some representatives of cyclic α-amino acids were converted to corresponding 1-phthalimido- and N-trifluoroacylated acid chlorides. Treatment of 2-(1H-benzimidazol-2-yl)acetonitrile with 1-phthalimidoacid chlorides in DMF unexpectedly gave 2-(1H-benzimidazol-2-yl)-3-(dimethylamino)-2-propenenitrile. On the other hand, the reaction of hetarylacetonitriles with N-trifluoroacylated
摘要将α-氨基异丁酸和一些环状α-氨基酸代表转化为相应的1-邻苯二甲酰亚胺基和N-三氟酰化酰氯。用1-邻苯二甲酰氯在DMF中处理2-(1 H-苯并咪唑-2-基)乙腈意外地得到2-(1 H-苯并咪唑-2-基)-3-(二甲基氨基)-2-丙烯腈。另一方面,杂芳基乙腈与N的反应-三氟酰化酰氯得到所需的(3-氰基-2-氧代-3-杂芳基丙基)-2,2,2-三氟乙酰胺,其经三氟乙酰化后提供目标2-氨基-3-杂芳基吡咯啉-4-酮。苯甲酰氯对苯并咪唑基氨基吡咯啉酮的酰化作用导致形成3-苯甲酰基-2,3-二氢-5-苯基-1 H-苯并[4,5]咪唑并[1,2- c ]吡咯并[3,2- e ]嘧啶-1-酮。 图形概要
General Access to Modified α‐Amino Acids by Bioinspired Stereoselective γ‐C−H Bond Lactonization
作者:Laia Vicens、Massimo Bietti、Miquel Costas
DOI:10.1002/anie.202007899
日期:2021.2.23
show that the use of bioinspired manganese catalysts and H2O2 under mild conditions, provides access to modified α‐amino acids via γ‐C−H bond lactonization. The system can efficiently target 1°, 2° and 3° γ‐C−H bonds of α‐substituted and achiral α,α‐disubstituted α‐amino acids with outstanding site‐selectivity, good to excellent diastereoselectivity and (where applicable) enantioselectivity. This methodology
α‐氨基酸代表了宝贵的一类天然产物,被用作生物和化学合成的基础。由于可用的天然氨基酸数量有限,并且它们在蛋白质组学,诊断,药物递送和催化中的广泛应用,对开发制备修饰的类似物的方法的需求日益增加。在这里,我们表明使用了生物启发性的锰催化剂和H 2 O 2在温和的条件下,可通过γ-C-H键内酯化作用获得修饰的α-氨基酸。该系统可有效靶向α-取代的和非手性α,α-二取代的α-氨基酸的1°,2°和3°γ-C-H键,具有出色的位点选择性,良好的非对映选择性和(如果适用)对映选择性。该方法可以被认为是完善的有机金属程序的替代方法。
Method for controlling the relative stem growth of plants
申请人:American Cyanamid Company
公开号:US04092147A1
公开(公告)日:1978-05-30
The invention relates to a method for controlling the relative stem growth of plants by applying to the foliage of the plants, or to soil containing seeds of the plants, a plant-growth-regulating amount of a dihydroimidazoisoindoledione or an optical or stereo isomer thereof.
The invention relates to a method for inhibiting the bud growth of plants by applying to the foliage of the plants, or to soil containing seeds of the plants, a plant-growth-regulating amount of a dihydroimidazoisoindoledione or an optical or stereo isomer thereof.