Stereospecific construction of stereogenic vicinal quaternary carbon atoms. Enantiospecific synthesis of (+)-valerane
作者:Adusumilli Srikrishna、Ranganathan Viswajanani
DOI:10.1016/0040-4039(96)00407-8
日期:1996.4
Stereo- and enantiospecificsynthesis of (+)-valerane starting from R-carvone utilising orthoester Claisen rearrangement and intramolecular diazo ketone cyclopropanation reactions for the construction of the two vicinalquaternarycarbonatoms is described.
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 vicinalstereogenicquaternarycarbonatoms, are described. Thus, orthoester Claisen rearrangement of 3-methylcarveol 6 furnishes the ester 9 containing the first quaternarycarbon atom
Enantiospecific First Total Synthesis of ent-Allothapsenol
作者:A. Srikrishna、K. Mahesh
DOI:10.1055/s-0031-1290527
日期:2012.4
The enantiospecific first total synthesis of the enantiomer of the irregular sesquiterpene from Ligusticumgrayi allothapsenol, starting from the readily available monoterpene (R)-carvone, is described, which confirmed the assumed absolute configuration of the natural product.