Syntheses of Amino-dideoxyallose and Amino-deoxyribose Derivatives Using Acylnitroso Dienophiles
作者:Albert Defoin、Hans Fritz、Guillaume Geffroy、Jacques Streith
DOI:10.1002/hlca.19880710709
日期:1988.11.2
in-situ-generated acylnitroso dienophiles 5a and 5b, leading thereby to the corresponding dihydrooxazines 7a–d and 8c–d. cis-Glycolization of these latter adducts stereospecifically gave the dihydro derivatives 9a–d and 10d which, after sequential hydrogenolysis, deacetalization, and instant cyclization, led to the aminodeoxyribose derivatives 17a, 17f, and 18, and to the amino-dideoxyallose compounds 17c
二甲基缩醛4的(E) -2,4-戊二烯醛与(的ë,ë) -和(ê,Ž)-2,4- hexadienals经历与区域选择性和立体有择的环加成反应中-原位-生成acylnitroso亲二烯体5a中和5b,从而得到相应的二氢恶嗪7a-d和8c-d。这些后者加合物的顺式-乙二醇化立体定向生成二氢衍生物9a-d和10d其在连续的氢解,脱缩醛化和立即环化之后,产生了氨基脱氧核糖衍生物17a,17f和18,以及氨基-脱氧核糖化合物17c和17h。这些哌啶子基-脱氧糖衍生物表现出很强的异头作用,即OHC(1)始终是轴向的,这是根据N(π)-σ*(COH)轨道压缩来解释的,与之相比,发音越不明显的原因就越多。古典吡喃糖系列。