Reaction sof d-lyxose and d-xylose with 2-methoxypropene under kinetic conditions
作者:Joelle Barbat、Jacques Gelas、Derek Horton
DOI:10.1016/0008-6215(91)89046-i
日期:1991.10
Abstract d -Lyxose ( 1 ) undergoes acetonation under kinetic conditions with 2-methoxypropene to give 2,3- O -isopropylidene-α- d -lyxofuranose ( 2 ) in high yield, further characterized as its 1,5-diacetate 3 , thus affording a preparative route to 2 . Forcing conditions are required to bring d -xylose ( 5 ) into reaction, leading to 39% of 3,5- O -isopropylidene-α-β- d -xylofuranose ( 7 , further
摘要d-Lyxose(1)在动力学条件下与2-甲氧基丙烯进行丙酮化反应,以高收率得到2,3-O-异亚丙基-α-d -lyxofuranananose(2),进一步表征为1,5-二乙酸3,因此提供前往2的准备路线。为使d-木糖(5)反应而需要强制条件,从而导致39%的3,5- O-异亚丙基-α-β-d-木呋喃糖(7,其进一步特征在于其1,2-二乙酸9), 33%的1,2:3,5-二-O-异亚丙基-α-d-木呋喃糖(6)和20%的2,3:4,5-二-O-异亚丙基-乙二醛-d-木糖(如图8所示,其进一步特征在于其二乙醛酸氢缩醛10)。在较早提出的糖动力学丙酮化的一般原理框架内,所有结果都易于合理化。