Cq. Wei et al., New ring construction strategy in taxane synthesis: stereocontrolled synthesis of taxane CB-ring system, J CHEM S P1, (23), 1999, pp. 3531-3536
A concise stereocontrolled construction of taxane CB-ring system (C --> CB)
is described. The key bottom and top linking of the eight-membered B-ring
were realized unprecedentedly by way of successive intermolecular aldol con
densation and intramolecular aldol cyclization.