The Diels–Alder reaction of (E)-3-trimethylsilyloxybuta-1,3-dienyl 2,3,4,6-tetra-O-acetyl-β-D-glucopyranoside and 4a,9a-epoxy-4a,9a-dihydroanthracene-1,4,9,10-tetrone is subject to high diastereocontrol; the cycloadduct is converted into (+)-4-demethoxydaunomycinomycinone by a six-step sequence.
(E)-3-三甲基甲
硅烷氧基
丁酸酯-1,3-二烯基2,3,4,6-四-O-乙酰基-β -
D-吡喃葡萄糖苷和4a,9a-环氧-4a,9a-二氢
蒽的Diels-Alder反应-1,4,9,10四面体受到高度非对映控制;环加合物通过六步序列转化为(+)-4-脱甲氧基十二碳烯酮。