Expeditious Procedure To Synthesize Ethers and Esters of Tri- and Tetrahydroxy[6]helicenebisquinones from the Dye-Intermediates Disodium 4-Hydroxy- and 4,5-Dihydroxynaphthalene-2,7-disulfonates
摘要:
A procedure is described for synthesizing appreciable quantities of both the tetradodecyloxy[6]-helicenebisquinone 1 (R = dodecyl), which exhibits unique optical properties but previously was difficult to prepare, and a variety of analogues. The synthesis starts from disodium 4,5rlihvdroxynaphthalene-2, 7-disulfonate, the commercially available dye-interme diate known as chromotropic acid. It gives enantiopure 1, with R = (i-Pr)(3)Si, whose silyl groups can be replaced by dodecyl and hexanoyl groups. The same procedure applied to disodium 4-hydroxynaphthalene-2,7disulfonate, also an inexpensive, commercially available chemical, works equally well to produce the corresponding molecules that have one fewer side chain. Key steps are the use of tosyl groups to protect phenols and of a method described seven years ago by Satoh, Itoh, Miura, and Nomura to transform the sulfonic acid functions to iodides. The structure of tetra-(1S)-camphanate 20, the ester of the reduction product of (-)-1 [R = (i-Pr)(3)Si], was analyzed by X-ray diffraction. It shows the absolute configurations and supports the presumed basis for the rule that the (1S)-camphanates of(P)-helicen-1-ols are more polar than their (M)-diastereomers.
Expeditious Procedure To Synthesize Ethers and Esters of Tri- and Tetrahydroxy[6]helicenebisquinones from the Dye-Intermediates Disodium 4-Hydroxy- and 4,5-Dihydroxynaphthalene-2,7-disulfonates
摘要:
A procedure is described for synthesizing appreciable quantities of both the tetradodecyloxy[6]-helicenebisquinone 1 (R = dodecyl), which exhibits unique optical properties but previously was difficult to prepare, and a variety of analogues. The synthesis starts from disodium 4,5rlihvdroxynaphthalene-2, 7-disulfonate, the commercially available dye-interme diate known as chromotropic acid. It gives enantiopure 1, with R = (i-Pr)(3)Si, whose silyl groups can be replaced by dodecyl and hexanoyl groups. The same procedure applied to disodium 4-hydroxynaphthalene-2,7disulfonate, also an inexpensive, commercially available chemical, works equally well to produce the corresponding molecules that have one fewer side chain. Key steps are the use of tosyl groups to protect phenols and of a method described seven years ago by Satoh, Itoh, Miura, and Nomura to transform the sulfonic acid functions to iodides. The structure of tetra-(1S)-camphanate 20, the ester of the reduction product of (-)-1 [R = (i-Pr)(3)Si], was analyzed by X-ray diffraction. It shows the absolute configurations and supports the presumed basis for the rule that the (1S)-camphanates of(P)-helicen-1-ols are more polar than their (M)-diastereomers.
Synthesis of macrocyclic chromotropic acid-based sulfonamides; their complexation properties and an unexpected photochemical reaction
作者:Hisham Fathy Sleem、Louise Nicole Dawe、Paris Elias Georghiou
DOI:10.1016/j.tetlet.2013.04.081
日期:2013.6
Chromotropic acid (CTA), a dihydroxynaphthalenedisulfonic acid is a reagent that is widely used for dyestuff manufacture, as a chromogen-forming reagent for the analysis of formaldehyde and as an intermediate for azo derivatives used as analyticalreagents. The synthesis of two new CTA-based macrocyclic tetra-sulfonamides 7 and 7a and their corresponding bis-sulfonamides 10 and 10a and their complexation