Practical Diastereoselective Synthesis and Scale-up Study of (+)-2-((1<i>R</i>,2<i>R</i>,3<i>R</i>,5<i>S</i>)-2-Amino-6,6-dimethylbicyclo[3.1.1]hept-3-yl)ethanol: A Key Intermediate of the Novel Prostaglandin D<sub>2</sub> Receptor Antagonist S-5751
作者:Takemasa Hida、Susumu Mitsumori、Tsunetoshi Honma、Yoshiharu Hiramatsu、Hiroshi Hashizume、Tetsuo Okada、Makoto Kakinuma、Kyozo Kawata、Katsuo Oda、Aiko Hasegawa、Toshiaki Masui、Hideo Nogusa
DOI:10.1021/op9001092
日期:2009.11.20
A new synthetic process was developed for (+)-2-((1R,2R,3R,5S)-2-amino-6,6-dimethylbicyclo[3.1.1]hept-3-yl)ethanol, a key intermediate of S-5751. Diastereoselective alkylation of (+)-nopinone with ethyl bromoacetate, formation of O-methyl oxime, and diastereoselective reduction with NaBH4−AlCl3 could be safely carried out. Stereochemistry of the (1R,2R,3R,5S)-6,6-dimethylbicyclo[3.1.1]heptane ring
开发了一种新的合成方法,用于(+)-2-((1 R,2 R,3 R,5 S)-2-氨基-6,6-二甲基双环[3.1.1]庚-3-基)乙醇, S-5751的关键中间体。可以安全地进行溴乙酸乙酯的(+)-nopinone的非对映选择性烷基化,O-甲基肟的形成以及NaBH 4 -AlCl 3的非对映选择性还原。讨论了(1 R,2 R,3 R,5 S)-6,6-二甲基双环[3.1.1]庚烷环的立体化学,以在这些反应上实现较高的非对映选择性。为了扩大规模,对NaBH的安全性进行了详细考虑4 -AlCl 3还原。