申请人:MONSANTO COMPANY
公开号:EP0398857A2
公开(公告)日:1990-11-22
Reactions of azide ion with 2-O-trifluoro-methanesulphonates of both 3,4:6,7-di-O-isopropylidene-D-glycero-D-talo-heptono-1,5-lactone (1) and of 3,4:6,7-di-O-isopropylidene-D-glycero-D-galacto-heptono-1,5-lactone (2) are disclosed to give predominantly 2-azido-2-deoxy-3,4:6,7-di-O-isopropylidene-D-glycero-D-galacto-heptono-1,5-lactone (4) initially which then isomerizes under moderate reaction conditions to 2-azido-2-deoxy-3,4:6,7-di-O-isopropylidene-D-glycero-D-talo-heptono-1,5-lactone (3).
本研究公开了叠氮离子与 3,4:6,7-二-O-异亚丙基-D-甘油-D-半乳-庚-1,5-内酯 (1) 和 3,4:6,7-二-O-异亚丙基-D-甘油-D-半乳-庚-1,5-内酯 (2) 的 2-O-三氟甲磺酸盐的反应,主要得到 2-叠氮-2-脱氧-3,4,6,7-二-O-异亚丙基-D-甘油-D-半乳-庚-1,5-内酯 (4):6,7- 二-O-异亚丙基-D-甘油-D-半乳-庚-1,5-内酯(4),然后在中等反应条件下异构化为 2-叠氮-2-脱氧-3,4:6,7-二-O-异亚丙基-D-甘油-D-半乳-庚-1,5-内酯(3)。