The aza-xylylene Diels–Alder approach for the synthesis of naturally occurring 2-alkyl tetrahydroquinolines
作者:Frank Avemaria、Sylvia Vanderheiden、Stefan Bräse
DOI:10.1016/s0040-4020(03)00915-3
日期:2003.8
The recently discovered intramolecular aza-xylylene Diels–Alder reaction, based on a 1,4-dehydrohalogenation reaction, was extended in terms of substrates and leaving groups allowing the assembly of tetrahydroquinolines in two synthetic steps. Intramolecular cleavage of a thiocarbamate using triphenylphosphine and tetrachloromethane (Appel conditions) to give chloromethyl phenylisocyanate has been
最近发现的基于1,4-脱氢卤代反应的分子内氮杂二甲苯Diels-Alder反应在底物方面得到扩展,并留下了允许在两个合成步骤中组装四氢喹啉的基团。首次提出了使用三苯基膦和四氯甲烷(阿佩尔条件)进行硫代氨基甲酸酯的分子内裂解,得到氯甲基苯基异氰酸酯。该方法的合成可行性在生物碱rac -Angustureine和1-甲基-2-丙基四氢喹啉的第一批总合成中得到了证明。