Asymmetric synthesis of pentono- and 6-deoxyhexono-?-lactamsvia hetero-Diels-Alder reactions with nitroso dienophile
作者:Albert Defoin、Herv� Sarazin、Thierry Sifferlen、Christiane Strehler、Jacques Streith
DOI:10.1002/hlca.19980810550
日期:——
Asymmetric Diels-Alder reaction of the pentadienoic and hexadienoic acids 2a,b with the chiral chloronitroso derivative 3 gave the primary adducts 4a,b with good-to-excellent enantioselectivity. Subsequent as- or trans-dihydroxylation and hydrogenolytic cleavage of the NO bond led to the 5-amino-5-deoxypentono-δ-lactams 13a, 14, 15a, and 16 in the D-ribose, L-arabinose, D-xylose, and L-lyxose series
戊二烯酸和己二酸2a,b与手性氯亚硝基衍生物3的不对称Diels - Alder反应得到具有良好至优异对映选择性的伯加合物4a,b。随后原样或反式二羟基化,并导致NO键的氢解裂解的5-氨基-5- deoxypentono-δ内酰胺13A,14,15A,和16中的d-核糖,L-阿拉伯糖,d木糖分别为L和lyxose系列,以及5-氨基5,6-二脱氧己基-δ-内酰胺类13b和15b 分别是D-阿洛糖和D-葡萄糖系列。