作者:Kumyul S. Albone、Jake Macmillan、Andrew R. Pitt、Christine L. Willis
DOI:10.1016/s0040-4020(01)87385-3
日期:1986.1
Full assignments of the 1H-nmr chemical shifts of the ring A protons in gibberellin A20 methyl ester 13-acetate have been made on the basis of 1H-, 2H- and 13C-nmr data of various deuteriated derivatives. These assignments have been used to prove that catalytic deuteriogenation of GA5-16, 17- epoxide-13-acetate is a syn-addition from the less hindered β-face accompanied by allylic exchange at C-1 giving
基于各种氘代衍生物的1 H-,2 H-和13 C-nmr数据,对赤霉素A 20甲酯13-乙酸酯中环A质子的1 H-nmr化学位移进行了完全赋值。这些分配已被用来证明GA 5 -16,17-环氧13-乙酸的催化氘代反应是受阻较少的β面的同构加成反应,并伴随C-1的烯丙基交换,从而在1β-处形成同位素标记。 ,2β-和3β-位置。与[1β,2β,3β- 2 H 3 ] GA 20的真实样品进行比较,证实了同位素标记的位置和立体化学通过在C-1,C-2和C-3立体选择性地引入氘的方法制备13-乙酸甲酯。[2α-的制备2 H] GA 20和[3α- 2 H] GA 20进行说明。