Asymmetric conversions of 10-bromo-10,11-dihydroquinines into 8-oxa-1-azabicyclo[4.3.0]nonane derivatives and related compounds
作者:Jacek Thiel、Andrzej Katrusiak
DOI:10.1016/s0957-4166(02)00050-2
日期:2002.2
treatment with acid the alkaloid 10 yields [(4S)-(E)-propenyl)-(2S)-piperidinyl]-6-methoxyquinoline-(αR)-methanol 12. Closure of the oxazolidine ring in 12 gives 14, the 9,9-dimethyl-derivative of 10, with the N(1) configuration inverted. The molecular structures of 10a and 14, determined by X-ray diffraction, show their similar conformations except for the axial (E)-propenyl substituent, disordered in
为了获得对它们未开发的手性的见解,已经研究了(10 R)-和(10 S)-溴-10,11-二氢奎宁2a和2b的一些转化。(10 R)-非对映异构体2a立体选择性地转化为(4 S)-(E-丙烯基)-(6 S,7 R)-(6-甲氧基-喹啉-4-基)-8-氧杂-(1 R) -氮杂双环[4.3.0]壬烷10是母体奎宁1的新型重排产物,并在固态下显示N(1)-(S)-构型(10a)。的(10S)-非对映异构体2b得到10及其(Z)-丙烯基异构体15(比例为55:45),以及(Z)-3,10-二氢化-10,11-二氢奎宁19。与酸处理生物碱10倍的产率[(4-小号) - (É) -丙烯基) - (2-小号) -哌啶] -6- methoxyquinoline-(α [R )-甲醇12。在12中关闭恶唑烷环,得到14(9,9-二甲基衍生物10),N(1)构型倒置。10a和10a的分子结构通过X射线衍射测