Application of new optically pure ketene equivalents derived from tartaric acids to the total, asymmetric syntheses of (+)-6-deoxycastanospermine and (+)-6-deoxy-6-fluorocastanospermine
作者:Jean-Louis Reymond、Pierre Vogel
DOI:10.1039/c39900001070
日期:——
5S, 7S)-3-ethyl-2-oxo-6, 8-dioxa-3-azabicyclo[3.2.1]octane-7-carboxylic acid (8) whose 1-cyanovinyl ester (10) added to furan to give, after two recrystallizations, an optically pure 7-oxabicyclo[2.2.1]hept-5-en-2-yl derivative (11) that was converted into (+)-6-deoxycastanospermine (+)-(2) and (+)-6-deoxy-6-fluorocastanospermine (+)-(3).
二-O-乙酰基-(S,S)-酒石酸酐与二乙缩醛的缩合。N-乙基氨基乙醛得到(1 S,5 S,7 S)-3-乙基-2-氧代-6,8-二氧杂-3-氮杂双环[3.2.1]辛烷-7-羧酸(8),其1-氰基乙烯基将酯(10)添加到呋喃中,经过两次重结晶后,得到光学纯的7-氧杂双环[2.2.1]庚-5-烯-2-基衍生物(11),将其转变为(+)-6-脱氧castanospermine( +)-(2)和(+)-6-脱氧-6-氟castanospermine(+)-(3)。