کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1345392 | 1500337 | 2015 | 5 صفحه PDF | دانلود رایگان |
The regiospecific reduction and Favorskii rearrangement of enantiopure tetrabromoepifenchone, which could be easily obtained by bromination of camphor, have been investigated. The selective formation of new functionalized chiral bicyclo[2.2.1]heptane and bicyclo[2.1.1]hexane derivatives in good yield has been demonstrated. Our approach provides a simple pathway for the large-scale synthesis of a wide range of novel functionalized bicyclic terpenoids starting from easily available camphor.
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(1S,4S,7R)-1,7-Dibromo-4-(bromomethyl)-3,3-dimethylbicyclo[2.2.1]heptan-2-oneС10Н13ОBr3Ee = 100%[α]D20 = −41.0 (c 0.5, MeOH)Source of chirality: (R)-(+)-camphor
(1S,4R,7R,1′S,4′R,7′R)-4,4′-(E)-Ethene-1,2-diylbis(1,7-dibromo-3,3-dimethylbicyclo[2.2.1]heptan-2-one)С20Н24О2Br4Ee = 100%[α]D20 = +68.3 (c 0.95, DMSO)Source of chirality: (R)-(+)-camphor
(1R,4R,1′R,4′R)-4,4′-(E)-Ethene-1,2-diylbis(1-bromo-3,3-dimethylbicyclo[2.2.1]heptan-2-one)С20Н26О2Br2Ee = 100%[α]D20 = +33.6 (c 0.654, DMSO)Source of chirality: (R)-(+)-camphor
(1R,4R,6S)-6-Bromo-4-(dibromomethyl)-5,5-dimethylbicyclo[2.1.1]hexane-1-carboxylic acidС10Н13О2Br3Ee = 100%[α]D20 = −1.2 (c 0.5, MeOH)Source of chirality: (R)-(+)-camphor
(1R,4S,6S)-6-Bromo-4-(bromomethyl)-5,5-dimethylbicyclo[2.1.1]hexane-1-carboxylic acidС10Н14О2Br2Ee = 100%[α]D20 = +33.2 (c 0.5, MeOH)Source of chirality: (R)-(+)-camphor
(1R,4S,6R)-6-Bromo-4,5,5-trimethylbicyclo[2.1.1]hexane-1-carboxylic acidС10Н15О2BrEe = 100%[α]D20 = −99.8 (c 0.5, MeOH)Source of chirality: (R)-(+)-camphor
(1R,4R)-4,5,5-Trimethylbicyclo[2.1.1]hexane-1-carboxylic acidС10Н16О2Ee = 100%[α]D20 = −7.2 (c 0.5, MeOH)Source of chirality: (R)-(+)-camphor
(1R,4R,6R,1′R,4′R,6′R)-4,4′-(E)-Ethene-1,2-diylbis(6-bromo-5,5-dimethylbicyclo[2.1.1]hexane-1-carboxylic acid)С20Н26О4Br2Ee = 100%[α]D20 = −21.6 (c 0.95, EtOH)Source of chirality: (R)-(+)-camphor
(1R,4R,1′R,4′R)-4,4′-(E)-Ethene-1,2-diylbis(5,5-dimethylbicyclo[2.1.1]hexane-1-carboxylic acid)С20Н28О4Ee = 100%[α]D20 = +15.0 (c 0.945, EtOH)Source of chirality: (R)-(+)-camphor
(1S,4S,7R)-4,7-Dibromo-2,2-dimethyl-3-oxobicyclo[2.2.1]heptane-1-carboxylic acidС10Н12О3Br2Ee = 100%[α]D20 = −11.2 (c 0.5, MeOH)Source of chirality: (R)-(+)-camphor
(1S,4R)-4-Bromo-2,2-dimethyl-3-oxobicyclo[2.2.1]heptane-1-carboxylic acidС10Н12О3BrEe = 100%[α]D20 = −0.4 (c 0.5, MeOH)Source of chirality: (R)-(+)-camphor
Journal: Tetrahedron: Asymmetry - Volume 26, Issues 15–16, 31 August 2015, Pages 810–814