乙酸酐 、
(2S,3S,4S,5R,6S)-3-Benzyloxy-5-(tert-butyl-dimethyl-silanyloxy)-6-methoxy-4-(4-methoxy-benzyloxy)-tetrahydro-pyran-2-carbaldehyde 在
potassium carbonate 作用下,
以
乙腈 为溶剂,
以88%的产率得到Acetic acid (3S,4S,5R,6S)-3-benzyloxy-5-(tert-butyl-dimethyl-silanyloxy)-6-methoxy-4-(4-methoxy-benzyloxy)-tetrahydro-pyran-(2Z)-ylidenemethyl ester