Cyclic acetals of 4,1′,6′-trichloro-4,1′,6′-trideoxy-galacto-sucrose and their conversion into methyl ether derivatives
作者:Riaz Khan、Gita Patel
DOI:10.1016/0008-6215(90)84298-9
日期:1990.5
3',4'-di-O-acetyl-4,1',6'-trichloro-4,1',6'-trideoxy-2,3-O- isopropylidene- galacto-sucrose (4, 38%), 3'-O-acetyl-4,1',6'-trichloro-4,1',6'-trideoxy-2,3-O- isopropylidene- galacto-sucrose (5, 13%), and 2,3',4'-tri-O-acetyl-4,1',6'-trichloro- 4,1',6'-trideoxy-galacto-sucrose (6, 13%). Methylation of 4 followed by removal of the protecting groups gave 4,1',6'-trichloro-4,1',6'-trideoxy-6-O-methyl- galacto-
5.5当量的4,1',6'-三氯-4,1',6'-三苯氧基半乳糖蔗糖(1)的酸催化反应。在N,N-二甲基甲酰胺中加入2-甲氧基丙烯,然后乙酰化,得到3',4'-二-O-乙酰基-4,1',6'-三氯-4,1',6'-三甲氧基-2,3- O-异亚丙基-6-O-(1-甲氧基-1-甲基乙基)-半乳糖蔗糖(2,2%),6,3',4'-三-O-乙酰基-4,1',6'-三氯-4,1',6'-三苯氧基-2,3-O-异亚丙基-半乳糖-蔗糖(3,31%),3',4'-二-O-乙酰基-4,1',6'-三氯-4,1',6'-三甲氧基-2,3-O-异亚丙基-半乳糖蔗糖(4,38%),3'-O-乙酰-4,1',6'-三氯-4,1 ',6'-三甲氧基-2,3-O-异亚丙基-半乳糖蔗糖(5,13%)和2,3',4'-三-O-乙酰基-4,1',6'-三氯- 4,1',6'-丁氧基半乳糖蔗糖(6,13%)。4的甲基化,然后除去保护基团,得到4