据报道,通过2,3-二碘联苯的高度区域选择性金属-碘交换(MIE),可以高效,通用地合成邻碘联苯硼酸。联苯片段的大小很大程度上控制了位点选择性,仅以优异的位点选择性提供了末端芳基硼酸衍生物。发现联苯上的取代基(R 1和R 2)的性质对反应性有影响,但对区域选择性没有影响。带有给电子基团的产物提供了最佳的反应性和最高的分离产率。合成的衍生物也进行了体外测试对四种菌株和一种真菌菌株具有抗菌活性。这表明(2-碘-4'-异丙基-[1,1'-联苯] -3-基)硼酸6 A和(3-(苯并[ d ] [1,3]二氧戊基5-基) -2-碘-5-甲氧基苯基)硼酸22 A具有最强的抗菌和抗真菌活性,对蜡状芽孢杆菌和白色念珠菌的MIC分别为0.10和0.3 mg mL -1。还检查了在室温下对酰胺化反应的催化活性,这揭示了一种新的最佳催化剂,(2-碘-4',5-二甲氧基-[1,1'-联苯] -3-基)硼酸19 A
Derivatives of L-proline, their preparation and their biological uses
申请人:Inorgan SA Recherche & Developpement Pharmaceutiques, CAS
公开号:US05212158A1
公开(公告)日:1993-05-18
The L-proline derivatives of the invention correspond to the Formula I: ##STR1## in which R.sub.1 corresponds to the Formula II: ##STR2## in which R is a carbonyl group, an acyl group --Y--CO-- or an oxy-acyl group --O--Y--CO--, Y being an alkyl or an alkenyl chain, Z being one or more hydrogen atoms, or one or more substituents chosen from among halogen atoms, CF.sub.3, alkyl or alkoxy groups and an alkylenedioxy group in the case of two neighbouring substituents, R.sub.2 is --NH.sub.2, --OH, or a derivative of these groups, A.sub.1 and A.sub.2 are amino acid residues and B.sub.1 and B.sub.2 represents a hydrogen atom or a methyl group, and the pharmacologically acceptable salts of these derivatives. These derivatives are useful particularly as the active principles of medicines possessing, in particular, a nootropic action.
The use of cellulose (chromatography paper) as a cheap, versatile and non-covalent support for organic molecules during multi-step synthesis
作者:Stephen E. Shanahan、Douglas D. Byrne、Graham G. A. Inglis、Mahbub Alam、Simon J. F. Macdonald
DOI:10.1039/b208083d
日期:2002.10.18
Cellulose chromatography paper provides a novel non-covalent support for synthesis and in-situ purification of multi-dimensional arrays.
纤维素色谱纸提供了一种新颖的非共价支持,用于多维阵列的合成和原位纯化。
Regioselective synthesis of <i>ortho</i>-iodobiphenylboronic acid derivatives: a superior catalyst for carboxylic acid activation
作者:Raed M. Al-Zoubi、Walid K. Al-Jammal、Robert McDonald
DOI:10.1039/c9nj05708k
日期:——
An efficient and versatile synthesis of ortho-iodobiphenylboronic acids via the highly regioselective metal–iodine exchange (MIE) of 2,3-diiodobiphenyls is reported. The site-selectivity is very much controlled by the size of the biphenyl fragment, providing only the terminal arylboronic acidderivatives in excellent site-selectivity. The nature of the substituents (R1 and R2) on the biphenyls is found
据报道,通过2,3-二碘联苯的高度区域选择性金属-碘交换(MIE),可以高效,通用地合成邻碘联苯硼酸。联苯片段的大小很大程度上控制了位点选择性,仅以优异的位点选择性提供了末端芳基硼酸衍生物。发现联苯上的取代基(R 1和R 2)的性质对反应性有影响,但对区域选择性没有影响。带有给电子基团的产物提供了最佳的反应性和最高的分离产率。合成的衍生物也进行了体外测试对四种菌株和一种真菌菌株具有抗菌活性。这表明(2-碘-4'-异丙基-[1,1'-联苯] -3-基)硼酸6 A和(3-(苯并[ d ] [1,3]二氧戊基5-基) -2-碘-5-甲氧基苯基)硼酸22 A具有最强的抗菌和抗真菌活性,对蜡状芽孢杆菌和白色念珠菌的MIC分别为0.10和0.3 mg mL -1。还检查了在室温下对酰胺化反应的催化活性,这揭示了一种新的最佳催化剂,(2-碘-4',5-二甲氧基-[1,1'-联苯] -3-基)硼酸19 A