<2R,3R,4S,5R>-2-Benzyloxymethyl-4-t-butyldimethylsilyloxy-3-hydroxy-8-(4-methoxybenzyl)-6,8-diaza-1-oxaspiro<4.4>nonane-7,9-dione 在
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
以57%的产率得到<2S,3S,4S,5R>-2-Benzyloxymethyl-3,4-dihydroxy-8-(4-methoxybenzyl)-6,8-diaza-1-oxaspiro<4.4>nonane-7,9-dione