Reversible Blocking of Amino and Carboxyl Groups

Bodanszky, Miklos

doi:10.1007/978-3-642-78056-1_3

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2005

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“…In this case, controlling reaction time is crucial for the selective hydrolysis of the methyl ester while avoiding cleaving the tert -butyl ester groups. Due to the sensitivity of the tert -butyl ester groups to acid, about 1 equiv of acetic acid (based on the amount of LiOH) was used to acidify the reaction mixture after the hydrolysis of 7f .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Crescent Aromatic Oligoamides

et al. 2005

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[structures: see text] This article describes the synthetic procedures for the preparation of crescent (and helical) aromatic oligoamides developed in recent years in our laboratory. The large-scale preparation of a variety of monomers derived from various tetrasubstituted benzenes is presented. Three different strategies for constructing various oligomers consisting of meta- and meta/para-linked benzene residues are discussed. Factors affecting coupling efficiency and yields are analyzed. The developed synthetic methods have provided the basis for the preparation of longer oligomers and for the development of solid-phase synthesis.

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Section: Resultsmentioning

confidence: 99%

“…(2) Building Block 2. This compound was prepared by methylating the methyl esters of the known 2,3-dihydroxy-4-nitrobenzoic acid. , The resulting 2,3-dimethoxy-4-nitrobenzoate was hydrolyzed into the corresponding acid 2 .…”

Section: Resultsmentioning

confidence: 99%