求助三篇文献,不知道哪位大大能帮忙下载呢?同求Rickborn, Bruce. "The Retro–Diels–Alder Reaction Part II. Dienophiles with One or More Heteroatom." Organic Reactions (1998).? ? Tsuji J, Nagashima T, Qui N T, et al. Facile oxidative conversion of hydrazides of carboxylic acids to corresponding acids, esters and amides using copper compounds[J]. Tetrahedron, 1980, 36(10): 1311-1315.查看更多