反应详情

When the desired product is the side chain of taxol, N-benzoyl-(2R,3S)-3-phenylisoserine, R1 is phenyl, and R7 is preferably trimethylsilyl. In this synthesis the product of the reaction Scheme 1 is (3R,4S)-3-triisopropylsilyloxy-4-phenyl-2-azetidin-2-one (see Scheme 2), which is hydrolyzed, for example with hydrochloric acid, to yield the corresponding (2R,3S)-3-phenylisoserine as hydrochloric acid salt. The phenylisoserine is then benzoylated by procedures known in the art, for example, the Schotten-Baumann procedure, and purified, if necessary, by recrystallization or through a short silica gel column to give enantiomerically pure N-benzoyl-(2R,3S)-3-phenylisoserine (see Scheme 3).

1. customIn this synthesis
2. customthe product of the reaction Scheme 1