作者:Y. Jagadeesh、B. Venkateswara Rao
DOI:10.1016/j.tetlet.2011.09.043
日期:2011.11
Radicamine B 5 was synthesized from p-hydroxy benzaldehyde 7 stereoselectively using acid catalysed amido cyclisation with the help of neighbouring group participation (NGP). Without NGP both radicamine B 5 and its epimer 5-epi radicamine B 6 were obtained. The key steps of the synthesis are Sharpless asymmetric dihydroxylations and acid mediated amido cyclisation.
Radicamine B 5由对羟基苯甲醛7借助邻域参与(NGP)借助酸催化的酰胺基环化立体选择性地合成。在没有NGP的情况下,均获得了拉迪明B 5及其差向异构体5-表拉迪明B 6。合成的关键步骤是Sharpless不对称二羟基化反应和酸介导的酰胺基环化反应。