Lewis acid stereocontrolled additions of a silyl ketene acetal to 2,3-di-O-isopropylidene-d-glyceraldehyde nitrones. Synthesis of l-isoxazolidinyl nucleosides
作者:Pedro Merino、Eva M del Alamo、Maite Bona、Santiago Franco、Francisco L Merchan、Tomas Tejero、Odile Vieceli
DOI:10.1016/s0040-4039(00)01674-9
日期:2000.11
The reaction of O-methyl-O-tert-butyldimethylsilyl ketene acetal with N-benzyl and N-methyl-2,3-O-isopropylidene-d-glyceraldehyde nitrones in the presence of boron trifluoride etherate afforded the corresponding isoxazolidin-5-ones in excellent yields and anti-selectivities. The obtained compounds were used as key intermediates for the synthesis of isoxazolidinyl nucleosides of the l-series.
的反应ö甲基ö -叔丁基二甲基烯酮乙缩醛与ñ -苄基和Ñ甲基-2,3- Ö在三氟化硼醚,得到相应的异恶唑烷-5-酮存在下异亚丙基- d甘油醛硝酮具有优异的收率和抗选择性。所获得的化合物用作合成l系列异恶唑啉基核苷的关键中间体。