Asymmetric addition of nucleophiles to C-1 position of isoquinolines using ( S )-alanine derivatives as chiral auxiliaries
作者:Takashi Itoh、Kazuhiro Nagata、Michiko Miyazaki、Keiko Kameoka、Akio Ohsawa
DOI:10.1016/s0040-4020(01)00881-x
日期:2001.10
were allowed to react with a nucleophile (silyl enol ether or allyltributyltin) in the presence of an acyl chloride derived from (S)-alanine to afford the 1,2-addition products in good chemical yields and high stereoselectivity. The bromo groups were readily removed by a reduction process in which the double bond at C3–C4 was also reduced. Thus the reaction system provided a general method to synthesize
使5,8-二溴异喹啉衍生物与亲核试剂(甲硅烷基烯醇醚或烯丙基三丁基锡)在衍生自(S)-丙氨酸的酰氯存在下反应,以良好的化学收率和高立体选择性提供1,2-加成产物。溴基很容易通过还原过程除去,在还原过程中,C3–C4处的双键也被还原了。因此,反应体系提供了一种合成不对称的1-取代的四氢异喹啉的通用方法。为了确定反应产物的绝对构型,以对映体纯形式合成(-)-高麦芽糖苷。从中间的N-酰化的异喹啉鎓盐的构象可以合理地理解立体选择性。