Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, USA.
Org Lett. 2011 Dec 2;13(23):6288-91. doi: 10.1021/ol202773t. Epub 2011 Nov 9.
Reaction of propargylmagnesium bromide with 2,3;5,6-di-O-isopropylidene-D-mannonolactone followed by highly stereoselective reduction of the so-formed lactol with sodium borohydride gives a syn-diol from which practical syntheses of 2-keto-3-deoxy-D-glycero-D-galactononulosonic acid (KDN) and various partially protected derivatives have been achieved all of which feature the oxidative unmasking of the α-keto acid moiety from the alkyne.
炔丙基溴化镁与 2,3;5,6-二-O-亚异丙基-D-甘露诺内酯反应,然后用硼氢化钠对所形成的内醇进行高度立体选择性还原,得到顺二醇,由此可实用合成 2-酮基-3-脱氧-D-甘油-D-半乳糖壬酮酸(KDN)和各种部分保护的衍生物,这些都具有从炔烃中氧化脱保护α-酮酸部分的特点。