Kc. Nicolaou et al., TOTAL SYNTHESIS OF TAXOL .2. CONSTRUCTION OF A-RING AND C-RING INTERMEDIATES AND INITIAL ATTEMPTS TO CONSTRUCT THE ABC RING-SYSTEM, Journal of the American Chemical Society, 117(2), 1995, pp. 634-644
A method for the formation of Taxol's ABC ring system has been develop
ed. General methods for the synthesis of versatile synthons for Taxol'
s A ring (8) and C ring (55) are presented. A model study using a simp
lified C ring synthon (17) confirmed the viability of the sequential S
hapiro-McMurry strategy for formation of Taxol's B ring. Careful explo
ration of the chemistry of various A-B ring conjugates allowed the dev
elopment of a successful method for formation of the B ring in a more
functionalized system.