[5R-(5α,7β,8α,9α)]-8,9-isopropylidenedioxy-7-[(4-methoxybenzyl)oxymethyl]-6-oxa-1,3-diazaspiro[4.4]nonane-2,4-dione 在
palladium on activated charcoal
氢气 作用下,
以
乙酸乙酯 为溶剂,
反应 0.5h,
以100%的产率得到[5R-(5α,7β,8α,9α)]-1,3-diaza-7-hydroxymethyl-8,9-isopropylidenedioxy-6-oxaspiro[4.4]nonane-2,4-dione