Glycosylidene Carbenes. Part 21. Synthesis ofN-tosylglycono-1,4-lactone hydrazones as precursors of glycofuranosylidene carbenes
作者:Sissi E. Mangholz、Andrea Vasella
DOI:10.1002/hlca.19950780424
日期:1995.6.28
The N′-(glycofuranosylidene)toluene-4-sulfonohydrazides 5 and 10 (Scheme 1) were prepared in good yields by oxidation (1,3-dibromo-5,5-dimethylhydantoin/Et3N) of the N′-glycosyltoluene-4-sulfonohydrazides 4 and 9, which were obtained from 2,3,5-tri-O-benzyl-D-ribose (3) and 2,3,5-tri-O-benzyl-D-arabinose (8), respectively, and toluene-4-sulfonohydrazide. The analogous naphthalene-2-sulfonohydrazides
所述Ñ ' - (glycofuranosylidene)甲苯-4- sulfonohydrazides 5和10(方案1)以良好的收率通过氧化制备(1,3-二溴-5,5-二甲基海因/ ET 3 N)的的Ñ '-glycosyltoluene- 4-磺酰肼4和9,分别从2,3,5-三-O-苄基-D-核糖(3)和2,3,5-三-O-苄基-D-阿拉伯糖(8)获得。和甲苯-4-磺酰肼。类似地由3和3制备类似的萘-2-磺酰肼7和12。8通过6和11。在苯酚钠盐15(方案2)的存在下进行光解,最好原位产生,产生端基端异构的糖苷16,一些5和痕量的糖苷(1 R)/(1 S)-17。15在THF中的光解得到砜α-D/β-D- 18。15(石英滤光片)和富马酸二甲酯的光解反应生成单个环丙烷19,砜类α-D/β-D- 18和N-(呋喃呋喃糖基)-N'-(核呋喃基亚砜)甲苯-4-磺酰肼20。类似地,N-苯基马