Acid-Catalyzed Rearrangement of 3-Aza-8-oxatricyclo[3.2.1. 02,4]octan-6-one Acetals. Highly Stereoselective Total Synthesis of 3-Amino-3-deoxy-D-altrose and Derivatives
作者:Cristina Nativi、Jean-Louis Reymond、Pierre Vogel
DOI:10.1002/hlca.19890720504
日期:1989.8.9
amines ([3-endo-alkoxy-5-oxo-7-oxabicyclo[2.2.1]hept-2-exo-yl]carbamates 16, 20, 24, and 28 and 33). Using (+)-(1R, 4R)-5,5-bis(benzyloxy)7-oxabicyclo[2.2.1]hept-2-ene((+)-6) derived from furan and l-cyanovinyl (1S)-camphanate, the method was applied to prepare 2-O-benzyl-3-[(tert-butoxy)carbonyiamino]-5-O-(3-chlorobenzoyl)-3-deoxy-β-D-altrofuranurono-6,1-lactone ((−)-37). This compound was converted to
将叠氮基甲酸乙酯和叠氮甲酸叔丁酯添加到7-氧杂双环[2.2.1]庚-5-烯-2-酮二甲基(5)和二苄基(6)乙缩醛中,得到区域异构的三唑啉混合物。后者得到相应的氮丙啶(6,6-二烷氧基-3-氮杂-8-氧杂三环[3.2.1.0 2,4 ]辛烷-3-羧酸15,19,23,和27和31上UV照射)。在质子酸存在下,氮丙啶被重新布置为保护的胺([3-桥-烷氧基-5-氧代-7-氧杂双环[2.2.1]庚-2-外型-基]氨基甲酸酯16,20,24,和28岁和33)。使用衍生自呋喃和1-氰基乙烯基的(+)-(1 R,4 R)-5,5-双(苄氧基)7-氧杂双环[2.2.1]庚-2-烯((+)- 6)(1 S)-樟脑酸酯,该方法用于制备2 - O-苄基-3-[(叔丁氧基)羰基氨基] -5 - O-(3-氯苯甲酰基)-3-脱氧-β-D-呋喃呋喃醛-6, 1-内酯((-)- 37)。该化合物被转化为3-氨基-3-