Acetic acid (2R,5R,6S,7S)-7-(tert-butyl-dimethyl-silanyloxymethyl)-7-hydroxy-2,3,3-trimethyl-4-oxo-1-oxa-spiro[4.4]non-6-yl ester 在
氯化亚砜 作用下,
以
吡啶 为溶剂,
以92%的产率得到Acetic acid (2R,5R,6S)-7-(tert-butyl-dimethyl-silanyloxymethyl)-2,3,3-trimethyl-4-oxo-1-oxa-spiro[4.4]non-7-en-6-yl ester