Chemical transformation of protoberberines. XII A novel synthesis of rhoeadine alkaloids. An alternative synthesis of a key intermediate, benzindenoazepine, for a synthesis of (.+-.)-cis-alpinigenine and (.+-.)-cis-alpinine from palmatine.
作者:MIYOJI HANAOKA、MITSURU INOUE、NOBUYUKI KOBAYASHI、SHINGO YASUDA
DOI:10.1248/cpb.35.980
日期:——
A formal synthesis of (±) -cis-alpinigenine (3) and (±) -cis-alpinine (4) was achieved by conversion of palmatine (7) into the key intermediate, benzindenoazepine (16), via the ring D-inverted 2, 3, 11, 12-tetraoxygenated phenolbetaine (14) and the 8, 14-cycloberbine (15) through photooxygenation, photochemical valence isomerization, and regioselective C-N bond cleavage of 15 as crucial reactions.
(±) -顺式-芹菜碱 (3) 和 (±) -顺式-芹菜碱 (4) 的正式合成是通过将巴马汀 (7) 转化为关键中间体苯并茚并氮杂卓 (16),再通过环 D 反式 2、3、11、12-四氧合苯酚甜菜碱 (14) 和 8、14-环小檗碱 (15) 的光氧合、光化学价式异构化和回归作用实现的、11,12-四氧合苯酚甜菜碱(14)和 8,14-环小檗碱(15),通过光氧合、光化学价异构化和 15 的区域选择性 C-N 键裂解等关键反应,实现了苯茚并氮杂卓(16)与苯茚并氮杂卓(4)的关键中间体的转化。