70981-13-4

Upstream product

• 20483-26-5 2α,6α-diacetoxy-4β-hydroxy-pseudoguaia-11(13)-en-12,8α-olide 
• 108-24-7 acetic anhydride 
• 5945-41-5 dl-Mexicanin I 
• 73407-84-8 (3aS,4aR,5R,7aS,8S,9aR)-5-Benzyloxy-4a,8-dimethyl-3,3a,4a,5,7a,8,9,9a-octahydro-azuleno[6,5-b]furan-2,4-dione 
• 73407-88-2 (3aα,4β,4aβ,5β,7aα,8α,9aβ)-3a,4,4a,5,7a,8,9,9a-Octahydro-8-hydroxy-4a,8-dimethyl-4-<(tetrahydro-2H-pyran-2-yl)oxy>-azyleno<6,5-b>furan-2(3H)-one 
• 73407-89-3 (3aα,4β,4aβ,5β,7aα,8α,9aβ)-3a,4,4a,5,7a,8,9,9a-octahydro-4a,8-dimethyl-3-methylene-4,5-bis<(tetrahydro-2H-pyran-2-yl)oxy>-azuleno<6.5-b>furan-2(3H)-one 
• 68241-56-5 (3aR,4R,4aS,5S,7aR,8R,9aS)-4a,8-Dimethyl-4,5-bis-(tetrahydro-pyran-2-yloxy)-3a,4,4a,5,7a,8,9,9a-octahydro-3H-azuleno[6,5-b]furan-2-one 
• 71686-37-8 (3aα,4α,4aβ,5β,7aα,8α,9aβ)-3a,4,4a,5,7a,8,9,9a-Octahydro-4-hydroxy-4a,8-dimethyl-5-(phenylmethoxy)azuleno<6,5-b>-furan-2(3H)-one 
• 71686-37-8 (3aα,4β,4aβ,5β,7aα,8α,9aβ)-3a,4,4a,5,7a,8,9,9a-Octahydro-4-hydroxy-4a,8-dimethyl-5-(phenylmethoxy)azuleno<6,5-b>-furan-2(3H)-one 
• 68241-57-6 (3aα,4β,4aβ,5β,7aα,8α,9aβ)-3a,4,4a,5,7a,8,9,9a-Octahydro-4,5-dihydroxy-3-methylene-4a,8-dimethylazuleno<6,5-b>-furan-2(3H)-one 
• 73407-87-1 (3aR,4R,4aS,5S,7aR,8R,9aS)-5-Benzyloxy-4a,8-dimethyl-4-(tetrahydro-pyran-2-yloxy)-3a,4,4a,5,7a,8,9,9a-octahydro-3H-azuleno[6,5-b]furan-2-one 

Relevant academic research and scientific papers

Chemical modification of Britanin and of inuchenolide C

Analogs of helenalin possessing a broad spectrum of biological activity have been synthesized from the readily available sesquiterpene lactones britanin and inuchenolide C. Conditions for the hydrolysis, oxidative transformations, and skeletal rearrangements of the pseudoguaianolides that are characteristic for plants of the genus Inula have been studied.

Helenanolides: Stereocontrolled Total Synthesis of dl-Bigelovin, dl-Mexicanin I, and dl-Linifolin A

Stereocontrolled total syntheses of the sesquiterpene lactones dl-bigelovin (11), dl-mexicanin I (12), and dl-linifolin A (13) are described.The syntheses start with the hydroazulenone 4 and proceed via the key epoxy alkohol 9.Elaboration of 9 into the tricyclic γ-lactone 14 dl-bigelovin. α-methylenation.Subsequent oxidation at C(4) completes the synthesis of dl-bigelovin.Epoxide opening of 9 with dilithioacetate provides access to tricyclic lactone 23 which gives way to 24 via reduction of ketone 25.Cleavage of the benzyl ether in 24 followed by α-methylenationand oxidation generates dl-mexicanin I.Acetylation of 12 affords dl-linifolin A.