Kc. Nicolaou et al., SYNTHESIS OF ABC TAXOID RING-SYSTEMS VIA A CONVERGENT STRATEGY, Journal of the Chemical Society, Chemical Communications, (12), 1993, pp. 1024-1026
Intermediates 4 and 5 have been coupled via a Shapiro reaction to affo
rd compound 6 which has been further elaborated to the ABC taxoid syst
ems 11 and 12 via a McMurry pinacol cyclization to 11 followed by oxid
ation to 12.