The simple syntheses of L-fucopyranose 1 and its three
analogues 2–4 are described. A key reaction is a stereocontrolled
elongation by one carbon unit at the side chain of an
α-D-arabino-pentodialdo-1,4-furanoside 9 with
MeMgI–ZnCl2 or Me3Al. Diastereofacial
selectivities of more than 92% were achieved.
简单报道了L-岩藻
吡喃糖1及其三种类似物2-4的合成方法。关键反应是用MeMgI-ZnCl2或Me3Al在α-D-阿拉伯
吡喃型
戊二醛-1,4-
呋喃糖9的侧链上进行立体控制的
碳链延长一
碳单位的反应。得到的手性面选择性超过92%。