Transformation of protoberberines into benzindenoazepines. Stereoselective synthesis of (±)-fumaritrine
作者:Miyoji Hanaoka、Masashi Iwasaki、Shun-ichiro Sakurai、Chisato Mukai
DOI:10.1016/s0040-4039(00)94291-6
日期:1983.1
Treatment of the 8,14-cycloberbine (16), derived from dihydroepiberberine (13), with p-toluenesulfonic acid in methanol effected regioselective ring cleavage to afford stereoselectively the cis-benzindenoazepine (17) after N-methylation. Mesylation and subsequent sodium borohydride reduction of 17 furnished (±)-fumaritrine (2) in a good yield.
在甲醇中,用对甲苯磺酸处理衍生自二氢表皮小ber碱(13)的8,14-环小b碱(16)进行区域选择性的环裂解,从而在N-甲基化后立体选择性地产生顺式-苯并腺苷(17)。甲磺酰化和随后的硼氢化钠还原得到的17种(±)-富马碱(2)的收率很高。