1,3-Diyl trapping reactions. Fundamental investigations with application to the synthesis of linearly fused tricyclopentanoids
作者:R.Daniel Little、George W. Muller、Manuel G. Venegas、Gary L. Carroll、Ahmed Bukhari、Larry Patton、Keith Stone
DOI:10.1016/0040-4020(81)80003-8
日期:1981.1
no practical effect upon the outcome of the trapping reaction. The intramolecular process is stereospecific with respect to diylophile geometry, and highly stereoselective with respect to the ring junction stereochemistry. Finally, an abortive attempt to synthesize the marine natural product Δ9(12)-capnellene (19) as well as a successful synthesis of the mold metabolite d,l- hirsutene (18) is presented
Synthetic studies on arene-olefin cycloadditions -III- total synthesis of (±)-hirsutene
作者:P.A Wender、J.J Howbert
DOI:10.1016/s0040-4039(00)88675-x
日期:1982.1
The arene-olefin meta-cycloaddition is shown to provide a facile entry into linear tricyclopentanoid skeleta. Hirsutene is synthesized in seven steps by this method from 2,6-dimethylbromobenzene and 2,2-dimethylpent-4-enal.
Reactive species from aromatics and oxa-di-π-methane rearrangement: a stereoselective synthesis of (±)-hirsutene from salicyl alcohol
作者:Vishwakarma Singh、Punitha Vedantham、Pramod K. Sahu
DOI:10.1016/j.tet.2004.06.096
日期:2004.9
yclo[5.2.2.02,6]undeca-10-en-8-one followed by radical induced cleavage of peripheral cyclopropane bond, olefination and Simmon–Smith reaction furnished 11-hydroxy-1-methyl-4-spirocyclopropanetricyclo[6.3.0.02,6]undecane that upon treatment with hydrogen on PtO2 and PCC oxidation gave 1,4,4-trimethyltricyclo[6.3.0.02,6]undecan-11-one, a known precursor. Wittig methylenation on this precursor gave hirsutene
Beginning with trans-2-methyl-4-cyclohexenecarboxylic acid (9), a total synthesis of linear triquinane sesquiterpene (±)-hirsutene (1) has been accomplished. An acid catalyzed intramolecular conjugate addition (7→6a) and a Pd2+-promoted highlystereocontrolled cyclization (5→4) were utilized for the key step of the sequence. Interestingly, some synthetic intermediates exhibited cytotoxicity.