A series of dimethyl 6-aryl-2,2dimethyl-2N-chromene-7,8-dicarboxylates were synthesized, and the photochromic properties of this new family of dimethyl-2H-chromenes were studied under continuous irradiation. The presence of the methoxycarbonyl groups was shown to stabilize the colored forms. This stabilization depended on the solvent, and in two cases the formation of long-lived opened forms was observed. Under irradiation with a mercury lamp, this family of 2H-chromenes showed a strong resistance: to photodegradation.
FeCl3-catalyzed convenient synthesis of 3-hydroxyphthalates has been achieved by a Diels–Alderreaction of furans with dimethylacetylenedicarboxylate, followed by ring-opening aromatization reaction of the Diels–Alder adducts, 7-oxabicyclo[2.2.1]hepta-2,5-diene derivatives. In addition, 7-azabicyclo[2.2.1]hepta-2,5-diene derivative, derived from N-Boc-pyrrole and dimethylacetylenedicarboxylate, also converted
Synthesis and Spectrokinetic Studies of a New Family of Dimethyl [2<i>H</i>]-Chromenes: Dimethyl 6-Aryl-2,2Dimethyl-[2<i>H</i>]-Chromene-7,8-Dicarboxylates
作者:Alain Maggiani、Arlette Tubul、Pierre Brun、André Samat
DOI:10.1080/10587250008023846
日期:2000.6.1
The synthesis of a series of dimethyl 6-aryl-2,2-dimethyl-[2H]-chromene-7,8-dicarboxylates is described. The photochromic properties of this new family of dimethyl-[2H]-chromenes have been studied in solution, under continuous irradiation. The presence of the methoxycarbonyl groups was shown to stabilise the coloured forms. The fading rates are generally low in comparison with the standard "naked" chromenes in the same experimental conditions. This stabilisation depends on the solvent used. We could observe the presence of one permanent opened form. Moreover, it seems that the synthesised molecules have a strong resistance toward photodegradation.
Agents for Eliminating Tumour-Initiating Cells
申请人:GODAVARI BIOREFINERIES LIMITED
公开号:US20150328245A1
公开(公告)日:2015-11-19
The present invention provides agents useful for eliminating tumour initiating cells, compositions thereof, uses thereof and methods of using the same.
A Convenient Synthesis of Polysubstituted Phenylphenols from Substituted Anilines
作者:Alain Maggiani、Arlette Tubul、Pierre Brun
DOI:10.1055/s-1997-1403
日期:1997.6
2' and 4'-Substituted arylfurans react with DMAD in the presence of Lewis acid to afford Diels-Alder adducts with good yields; a subsequent spontaneous or an acid-induced β-elimination leads to polysubstituted phenylphenols.
A series of dimethyl 6-aryl-2,2dimethyl-2N-chromene-7,8-dicarboxylates were synthesized, and the photochromic properties of this new family of dimethyl-2H-chromenes were studied under continuous irradiation. The presence of the methoxycarbonyl groups was shown to stabilize the colored forms. This stabilization depended on the solvent, and in two cases the formation of long-lived opened forms was observed. Under irradiation with a mercury lamp, this family of 2H-chromenes showed a strong resistance: to photodegradation.