71493-03-3Relevant articles and documents
Application of the chemo- and enantioselective cyclopropanation of polyenes to the total synthesis of (+)-bicyclohumulenone
Charette, Andre B.,Juteau, Helene
, p. 16277 - 16286 (2007/10/03)
The chemo- and enantioselective cyclopropanation of a monoprotected bis(allylic alcohol) using a chiral dioxaborolane- derived ligand and Zn(CH2I)2 was used as a key step in the total synthesis of (+)-bicyclohumulenone. The synthesis
Total Synthesis of (+)-Bicyclohumulenone
Fukuyama, Yoshiyasu,Hirono, Motoko,Kodama, Mitsuaki
, p. 167 - 170 (2007/10/02)
(+)-Bicyclohumulenone, a bicyclic sesquiterpene isolated from liverworts, was synthesized using stereoselective Simmons-Smith cyclopropanation and intramolecular alkylation of α-sulfenyl carbanion as key steps.
Stereoselective Cyclopropanation of the 10-Membered Enone. Total Synthesis of Bicyclohumulenone
Takahashi, Takashi,Yamashita, Yoshiro,Doi, Takayuki,Tsuji, Jiro
, p. 4273 - 4275 (2007/10/02)
The stereoselective synthesis of bicyclohumulenone and a discusion of the diastereoselectivity of the cylopropanation based on MM2 calculations are presented.
CONFORMATIONALLY SELECTIVE TRANSANNULAR CYCLIZATION OF HUMULENE 9,10-EPOXIDE. SYNTHESIS OF THE TWO SKELETALLY DIFFERENT CYCLOHUMULANOIDS: DL-BICYCLOHUMULENONE AND DL-AFRICANOL
Shirahama, H.,Hayano, K.,Kanemoto, Y.,Misumi, S.,Ohtsuka, T.,et al.
, p. 4835 - 4838 (2007/10/02)
Two cyclohumulanoids, dl-bicyclohumulenone (4) and dl-africanol (7) were synthetized through newly developed conformationally selective transannular cyclization of humulene 9,10-epoxide (2).The epoxide 2 was converted to a bicyclohumulenediol diacetate 3a in 70percent yield by treatment with BF3.Et2O-Ac2O, while treatment of 2 with trimethylsilyl trifluoromethansulfonate gave an africen-ol (5a and 5b) in 80percent yield.The two intermediates 3a and 5a furnished the natural products 4 and 7 in 30 and 8 percent yield from 2 respectively.