Synthesis of all stereoisomers of eudesm-11-en-4-ol. 2. Total synthesis of selin-11-en-4.alpha.-ol, intermedeol, neointermedeol, and paradisiol. First total synthesis of amiteol
摘要:
The syntheses of (+/-)-selin-11-en-4-alpha-ol (5), (+/-)-intermedeol (6), (+/-)-neointermedeol (7), (+/-)-amiteol (9), and the four remaining unnatural stereoisomers (+/-)-paradisiol (8), (+/-)-7-epi-amiteol (10), (+/-)-5-epi-neointermedeol (11), and (+/-)-5-epi-paradisiol (12) are described. In addition, the related (+/-)-evuncifer ether (25) has been prepared. The syntheses started from the octahydro-8-hydroxy-4a,8-dimethyl-2(1H)-naphthalenones 1-4. The reaction sequence employed for the synthesis of 5, 7, 9, and 12 involved Wittig reaction, oxidative hydroboration, oxidation, equilibration, and olefination. For the synthesis of 6, 8, 10, and 11 the interim equilibration step was omitted. The oxidative hydroboration was the key step in these syntheses.
Biomimetic cyclization of hedycaryol derivatives. Unexpected cyclization of phenyl sulfides with methyl iodide
作者:Mitsuaki Kodama、Kazuaki Shimada、Shô Itô
DOI:10.1016/s0040-4039(01)90367-3
日期:1981.1
Four isomeric hedycaryol phenyl sulfides, when reacted with Mel, yielded eudesmol derivatives with different stereochemistry from that of the acid cyclization products of the corresponding hedycaryols. New stereoisomers of α- and β-eudesmols, β-dehydroparadisiol and a defensive substance of termite were synthesized. Nephthenol phenyl sulfide yielded a 14-membered tetraene.
Sesquiterpene Glycosides and Phenylpropanoid Esters from <i>Phonus arborescens</i> (<i>Carthamus arborescens</i>)
作者:Alejandro F. Barrero、Pilar Arteaga、José F. Quílez、Ignacio Rodríguez、M. Mar Herrador
DOI:10.1021/np970122d
日期:1997.10.1
The tert-butylmethyl ether extract of the aerial parts of Phonus arborescens (L.) G. Lopez (Carthamus arborescens L.) afforded three new sesquiterpene glycosides, 10-epi-gamma-eudesmol beta-D-fucopyranoside (1), 10-epi-gamma-eudesmol 2'-O-acetyl-beta-D-fucopyranoside (2), and 4,5-dioxo-10-epi-4,5-seco-gamma-eudesmol 2'-O-acetyl-beta-D-fucopyranoside (3), together with two new phenylpropanoid esters, 3-(3,4-dihydroxyphenyl)propyl myristate (4) and 3-(3,4-dihydroxyphenyl)propyl palmitate (5) in addition to a series of known compounds. The structures of the new compounds were established by spectroscopic and chemical methods.