Ether, bis(1-chloroethyl) → N-benzoyl-O-(1-ethoxyethyl)-3-phenyl-isoserine

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The epoxide of the cis-cinnamate is then regioselectively opened to produce 3-phenyl isoserinamide. This 3-phenyl isoserinamide is hydrolyzed to produce 3-phenyl-isoserine, which in turn is reacted with benzoyl chloride to form N-benzoyl-3-phenyl-isoserine. Next, the N-benzoyl-3-phenyl-isoserine is reacted with 1-chloroethyl ether and a tertiary amine in methylene chloride to form N-benzoyl-O-(1-ethoxyethyl)-3-phenyl-isoserine. Then, N-benzoyl-O-(1-ethoxyethyl)-3-phenyl-isoserine is reacted with the alcohol shown below: ##STR8## This resulting intermediate is converted to taxol by hydrolytically removing the 1-ethoxyethyl and triethylsilyl protecting groups.

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