Convergent Synthesis of Naphthylisoquinoline Alkaloids: Total Synthesis of (+)-<i>O</i>-Methylancistrocline
作者:Phung Chau、Ivona R. Czuba、Mark A. Rizzacasa、Gerhard Bringmann、Klaus-Peter Gulden、Manuela Schäffer
DOI:10.1021/jo9607119
日期:1996.1.1
A highly convergent synthesis of the methyl ether derivative 2a of the naphthylisoquinoline alkaloid ancistrocline (2) is described. The key step involves a stereoselective biaryl coupling between the chiral oxazoline 3 and the Grignard reagent 4 derived from the optically active tetrahydroisoquinoline 8. The atropisomeric mixture was then converted to the separable acetamides 11 and 12, which were
描述了萘基异喹啉生物碱抗艾替考林(2)的甲基醚衍生物2a的高度收敛的合成。关键步骤涉及在手性恶唑啉3和衍生自旋光四氢异喹啉8的格利雅试剂4之间的立体选择性联芳基偶联。然后将阻转异构体混合物转化为可分离的乙酰胺11和12,以16:84的比例获得三个步骤的总产率为32%。然后,将主要的阻转异构体12转化为O-甲基蒽环茶碱(2a),该产物与衍生自相关生物碱抗金花环素(14)的半合成样品相同。