perruthenate, with NMO provide N,O‐acetal moieties by trapping the resulting iminium ion with the alcohol. These two transformations were demonstrated in the protecting group free synthesis of indolizidines (–)‐223AB and 3‐epi‐(–)‐223AB, compounds found in dart‐frog poison.
氨基
金属被
铂族金属氧化物,四氧化os和过氧化
四丙基铵与NMO的氧化环化通过将所生成的
亚胺离子捕获在醇中而提供了N,O-
乙缩醛部分。这两个转变在箭毒中发现的化合物
吲哚利嗪(–)‐ 223AB和3 -‐ epi –(–)‐ 223AB的无保护基合成中得到了证明。