Enantioselective Synthesis of (−)-Dihydrocodeinone: A Short Formal Synthesis of (−)-Morphine<sup>1</sup><sup>,</sup>
作者:Kathlyn A. Parker、Demosthenes Fokas
DOI:10.1021/jo0513008
日期:2006.1.1
applied in an asymmetric synthesis of (−)-dihydrocodeinone. A chiral cyclohexenol (R-32), from the CBS reduction of the enone, is the source of chirality. The first key step, tandem closure in which stereochemistry is controlled by geometric constraints, (−)-15b → (+)-16, was followed by an unprecedented reductive hydroamination, completing the synthesis of (−)-dihydroisocodeine ((−)-17) in 13 steps from
吗啡生物碱的自由基环化方法已用于(-)-二氢可待因酮的不对称合成中。手性环己烯醇(R - 32),是通过CBS烯酮的还原得到的,是手性的来源。第一个关键步骤是串联闭合,其中立体化学受几何约束(-)- 15b →(+)- 16的控制,随后进行了空前的还原性加氢胺化反应,完成了(-)-二氢异可待因((-)- 17)从市售材料中分13步进行。