作者:Luisa Garanti、Giorgio Molteni、Pietro Casati
DOI:10.1039/b206629g
日期:2002.11.13
Base treatment of hydrazonoyl chloride 2 with MeOPEG-supported acrylates 1 and acrylamides 5 gave the corresponding MeOPEG-supported 4,5-dihydropyrazoles 3 and 6. Basic hydrolysis of the cycloadducts caused the removal of the MeOPEG pendant giving 5-carboxy- or 5-aminocarbonyl-4,5-dihydropyrazoles 7 and 8, respectively. Cycloaddition between 2 and enantiopure MeOPEG-supported acrylamide 10 gave a mixture of MeOPEG-supported cycloadducts 11 and 12 with low diastereoselectivity.
用 MeOPEG 支持的丙烯酸酯 1 和丙烯酰胺 5 碱处理肼酰氯 2,可得到相应的 MeOPEG 支持的 4,5-二氢吡唑 3 和 6。环加成物的碱性水解可去除 MeOPEG 挂件,分别得到 5-羧基或 5-氨基羰基-4,5-二氢吡唑 7 和 8。2 与对映体纯 MeOPEG 支持的丙烯酰胺 10 之间的环加成反应产生了 MeOPEG 支持的环加成产物 11 和 12 的混合物,其非对映选择性较低。