Deoxyiminoalditols from Aldonolactones; IV: Preparation of 1,5-Dideoxy-1,5-iminoheptitols with L-glycero-D-manno, D-glycero-L-gulo and L-glycero-D-altro Configuration
作者:Inge Lundt、Robert Madsen
DOI:10.1055/s-1995-4009
日期:1995.7
Three novel 1,5-dideoxy-1,5-iminoheptitols 4, 12 and 20 were prepared by a convenient two-step procedure from 2,7-dibromo-2,7-dideoxyheptono-1,4-lactones 1, 9 and 17, respectively. The dibromolactones were either reacted directly with ammonia to give iminoheptonic acids which were then reduced, or the dibromolactones were first reduced to dibromoheptitols which were then treated with ammonia. The ring closure of the dibromo compounds was shown to proceed via epoxides. In addition, chain elongation of D-mannose and D-galactose with cyanide was carried out and the resulting heptonic acids were used for preparation of four novel bromodeoxyheptonolactones 6, 9, 14 and 17.
通过方便的两步程序,由 2,7-二溴-2,7-二脱氧庚酮-1,4-内酯 1、9 和 17 制备了三种新型 1,5-二脱氧-1,5-亚氨基庚醇 4、12 和 20 , 分别。二溴内酯直接与氨反应得到亚氨基庚酸,然后将其还原,或者二溴内酯首先还原为二溴庚醇,然后用氨处理。显示二溴化合物的闭环是通过环氧化物进行的。此外,用氰化物对D-甘露糖和D-半乳糖进行扩链,所得庚酸用于制备四种新型溴脱氧庚酸内酯6、9、14和17。