Full acetals of β-d-glycopyranosylnitromethanes and a 1,2-dideoxy-1-nitroalk-1-enitol derived from common hexoses
作者:Duy-Phong Pham-Huu、Mária Petrušová、James N. BeMiller、Peter Köll、Jüngen Kopf、Ladislav Petruš
DOI:10.1016/s0008-6215(97)00203-6
日期:1998.1
Mono-O-benzylidenation of the starting compounds with benzaldehyde dimethyl acetal followed by O-isopropylidenation led to 4,6-O-benzylidene-2,3-O-isopropylidene acetals having better solubilities in non-polar solvents than the di-O-isopropylidene acetals. Di-O-benzylidenation of β- d -mannopyranosylnitromethane gave both (endo-2,3):4,6- and (exo-2,3):4,6-di-O-benzylidene acetals. Transacetalation of 1-deoxy-1-nitro-
摘要在1,2中,由d-葡萄糖,d-半乳糖和d-甘露糖衍生的2,6-脱水-1-脱氧1-硝基醛糖(β-d-甘露糖基硝基甲烷)进行动力学控制的O-异丙基亚氨化。用4-甲苯磺酸催化的-二甲氧基乙烷得到高产率的2,3; 4,6-二-O-异亚丙基乙缩醛。对于d-甘露糖,还通过与2,2-二甲氧基丙烷反应以定量收率获得了双缩醛。起始化合物先与苯甲醛二甲基乙缩醛单-O-苄基化,然后再进行O-异亚丙基化,得到的4,6-O-亚苄基-2,3-O-异亚丙基缩醛在非极性溶剂中的溶解度高于二-O-异亚丙基乙缩醛。β-d-甘露吡喃糖基硝基甲烷的二-O-亚苄基化得到(endo-2,3):4,6-和(exo-2,3):4,6-di-O-亚苄基乙缩醛。