TERPENES TO TERPENES THROUGH PUSH-PULL CYCLOPROPANES - ENANTIOSELECTIVE CONSTRUCTION OF GERMACRANE, EUDESMANE AND COPA SESQUITERPENOID SKELETA FROM (-LIMONENE())
G. Mehta et Pvr. Acharyulu, TERPENES TO TERPENES THROUGH PUSH-PULL CYCLOPROPANES - ENANTIOSELECTIVE CONSTRUCTION OF GERMACRANE, EUDESMANE AND COPA SESQUITERPENOID SKELETA FROM (-LIMONENE()), Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 37(3), 1998, pp. 201-204
'Push-Pull' cyclopropane derivatives of the type 3 and 4 readily obtai
nable from (+)-limonene 7 via dichloroketene cycloaddition and base-me
diated ring contraction-rearrangement have been elaborated to mono-, b
i- and tricyclic skeleta present in germacrane, eudesmane and 'copa' s
esquiterpenoids, respectively. Our methodology provides stereo- and en
antioselective entry into these ring systems from a readily available
monoterpene chiron.