176979-40-1Relevant academic research and scientific papers
Stereoselective construction of vicinal stereogenic quaternary carbon atoms. Enantiospecific approaches to (+)-valeranef
Srikrishna, Adusumilli,Viswajanani, Ranganathan,Dinesh, Chikkana
, p. 4321 - 4327 (2007/10/03)
Two enantiospecific routes to (+)-valerane starting from (R)-carvone, using a combination of Claisen rearrangement and intramolecular diazo ketone cyclopropanation reactions for the stereoselective generation of the vicinal stereogenic quaternary carbon atoms, are described. Thus, orthoester Claisen rearrangement of 3-methylcarveol 6 furnishes the ester 9 containing the first quaternary carbon atom. Intramolecular cyclopropanation of the diazo ketone 10 derived from the ester 9, followed by regioselective reductive cyclopropane cleavage, generates the hydrindanone 11 containing all stereocentres of valerane. Ring expansion of the hydrindanone to tetralone and further reductions transform 11 into (+)-valerane 2. In another direction, homologation of the acid 5 followed by intramolecular cyclopropanation of the diazo ketone 24 and regioselective cyclopropane ring cleavage lead to valerenone 25, which is transformed into (H-)-valerane. The Royal Society of Chemistry 2000.
Stereo- and enantiospecific total synthesis of (-)-valeranone
Srikrishna,Viswajanani
, p. 521 - 523 (2007/10/03)
Stereo- and enantiospecific total synthesis of the irregular sesquiterpene, valeranone, starting from S-6-methylcarvone employing a hydrindanone to decalone ring expansion methodology, is described.
Stereospecific construction of stereogenic vicinal quaternary carbon atoms. Enantiospecific synthesis of (+)-valerane
Srikrishna,Viswajanani
, p. 2863 - 2864 (2007/10/03)
Stereo- and enantiospecific synthesis of (+)-valerane starting from R-carvone utilising orthoester Claisen rearrangement and intramolecular diazo ketone cyclopropanation reactions for the construction of the two vicinal quaternary carbon atoms is described.
