Selective cleavage of ketals and acetals under neutral, anhydrous conditions using triphenylphosphine and carbon tetrabromide
作者:Craig Johnstone、William J. Kerr、James S. Scott
DOI:10.1039/cc9960000341
日期:——
A convenient method for the selective removal of ketal and acetal protection under mild, neutral, anhydrous conditions using PPh3 and CBr4 is described.
Total synthesis of (+)-taylorione utilising modified Pauson–Khand reaction methodology
作者:Craig Johnstone、William J. Kerr、Udo Lange
DOI:10.1039/c39950000457
日期:——
A total synthesis of the sesquiterpene, (+)-taylorione 1 starting from (+)-2-carene is described; the key synthetic transformation is achieved in high yield by application of developed Pauson–Khand reaction techniques for gaseous olefins.
Detection, synthesis and absolute configuration of (+)-nortaylorione, a new terpene from Artemisia annua
作者:C.M de Oliveira、V.L Ferracini、M.A Foglio、A de Meijere、A.J Marsaioli
DOI:10.1016/s0957-4166(97)00169-9
日期:1997.6
Nortaylorione a new nor-sesquiterpene, was identified among minor components of Artemisia annua (hybrid plants) essential oil. Its relative and absolute configurations were determined by GC and GC/MS equipped with a chiral column and coinjecting the essential oil with synthetic standards (racemic and homochiral), obtained in a few steps from commercial reagents. Pauson-Khand reaction was used as the key reaction in both synthetic pathways. The new natural product, named (+)-nortaylorione, is the (1'S)-cis-2-[2',2'-dimethyI-3'-(3 ''-butanon-l ''-yl)-cyclopropyl]2-cyclopenten-1-one. (C) 1997 Elsevier Science Ltd.