Enantiomerically pure Diels-Alder adducts of maleic anhydride to furfural acetals through thermodynamic control. Single crystal and molecular structure of (1S,4R,4′S,5′S)-1-(4′,5′-dimethyldioxolan-2′-yl)-5,6-dimethylidene-7-oxabicyclo[2.2.1]hept-2-ene
摘要:
The acetal of (2S;,3S)-butane-2,3-diol and furfural is equilibrated in molten maleic anhydride with one major crystalline product which is a 1:1 complex of maleic anhydride and (1S,2R,3S,4R,4'S,5'S)-1-(4',5'-dimethyldioxolan-2'-yl)-7-oxabicyclo [2.2.1]hept-5-ene-2-exo,3-exo-dicarboxylic anhydride. This compound was converted into (1S,4R,4'S,5'S)-1-(4',5'-dimethyldioxolan-2'-yl)-5,6-dimethylidene-7-oxabicyclo[2.2.1]hept-2-ene (+)-12, the circular dichroism spectrum of which suggests a slightly skew s-cis-butadiene chromophore as confirmed by X-ray diffraction. Copyright (C) 1996 Elsevier Science Ltd
DOI:
10.1016/0957-4166(96)00417-x
作为产物:
描述:
(1S,2R,6S,7R)-1-((4S,5S)-4,5-Dimethyl-[1,3]dioxolan-2-yl)-4,10-dioxa-tricyclo[5.2.1.02,6]dec-8-ene-3,5-dione; compound with furan-2,5-dione 在
天然橡胶 作用下,
反应 24.0h,
以60%的产率得到(1S,2R,6S,7R)-1-((4S,5S)-4,5-Dimethyl-[1,3]dioxolan-2-yl)-4,10-dioxa-tricyclo[5.2.1.02,6]dec-8-ene-3,5-dione
参考文献:
名称:
Enantiomerically pure Diels-Alder adducts of maleic anhydride to furfural acetals through thermodynamic control. Single crystal and molecular structure of (1S,4R,4′S,5′S)-1-(4′,5′-dimethyldioxolan-2′-yl)-5,6-dimethylidene-7-oxabicyclo[2.2.1]hept-2-ene
摘要:
The acetal of (2S;,3S)-butane-2,3-diol and furfural is equilibrated in molten maleic anhydride with one major crystalline product which is a 1:1 complex of maleic anhydride and (1S,2R,3S,4R,4'S,5'S)-1-(4',5'-dimethyldioxolan-2'-yl)-7-oxabicyclo [2.2.1]hept-5-ene-2-exo,3-exo-dicarboxylic anhydride. This compound was converted into (1S,4R,4'S,5'S)-1-(4',5'-dimethyldioxolan-2'-yl)-5,6-dimethylidene-7-oxabicyclo[2.2.1]hept-2-ene (+)-12, the circular dichroism spectrum of which suggests a slightly skew s-cis-butadiene chromophore as confirmed by X-ray diffraction. Copyright (C) 1996 Elsevier Science Ltd
Enantiomerically pure Diels-Alder adducts of maleic anhydride to furfural acetals through thermodynamic control. Single crystal and molecular structure of (1S,4R,4′S,5′S)-1-(4′,5′-dimethyldioxolan-2′-yl)-5,6-dimethylidene-7-oxabicyclo[2.2.1]hept-2-ene
The acetal of (2S;,3S)-butane-2,3-diol and furfural is equilibrated in molten maleic anhydride with one major crystalline product which is a 1:1 complex of maleic anhydride and (1S,2R,3S,4R,4'S,5'S)-1-(4',5'-dimethyldioxolan-2'-yl)-7-oxabicyclo [2.2.1]hept-5-ene-2-exo,3-exo-dicarboxylic anhydride. This compound was converted into (1S,4R,4'S,5'S)-1-(4',5'-dimethyldioxolan-2'-yl)-5,6-dimethylidene-7-oxabicyclo[2.2.1]hept-2-ene (+)-12, the circular dichroism spectrum of which suggests a slightly skew s-cis-butadiene chromophore as confirmed by X-ray diffraction. Copyright (C) 1996 Elsevier Science Ltd