Stereoselective synthesis of 1,2-cis- and 2-deoxyglycofuranosyl azides from glycosyl halides
作者:Anton Štimac、Jože Kobe
DOI:10.1016/s0008-6215(00)00186-5
日期:2000.11
2-deoxy-2-fluoro-beta-D-arabino configurations were efficiently prepared from the appropriate 1,2-trans glycosyl halides bearing non-participating 0-2 substituent by inversion with sodium azide under phase transfer catalytic conditions (80-85% yields, 90-96% de). The same method failed to result in sufficiently good beta-selectivity starting from 2-deoxy-3,5-di-O-(p-toluoyl)-alpha-D-ery-thro-pentofuranosyl chloride
从具有1,2-三氟-β-阿拉伯糖基构型的合适的1,2-反式糖基卤化物有效地制备具有α-D-核糖,β-D-阿拉伯糖基和2-脱氧-2-氟-β-D-阿拉伯糖基构型的受保护的1,2-顺式呋喃呋喃糖基叠氮化物。 -在相转移催化条件下,通过叠氮化钠的转化使-参与0-2取代基-转化(80-85%产率,90-96%de)。从2-deoxy-3,5-di-O-(p-toluoyl)-alpha-D-ery-thro-pent呋喃呋喃糖酰氯(5alpha)(40%de)开始,相同的方法未能导致足够好的β-选择性。通过在室温下在二甲基亚砜中用铯或叠氮化钾处理5α及其对氯苯甲酰基类似物6α,大大提高了保护被保护的2-脱氧-β-D-赤型五氟呋喃糖基-叠氮基的选择性(74-80%de)温度(83-85%产率)。