Syntheses of Antitumor Morphinane Alkaloids, Sinococuline and 6-epi-, 7-epi-, and 6-epi-7-epi-Sinococuline, from Sinomenine
作者:Yukio Hitotsuyanagi、Kunihiko Nishimura、Hiroshi Ikuta、Koichi Takeya、Hideji Itokawa
DOI:10.1021/jo00119a037
日期:1995.7
An antitumor alkaloid, sinococuline (1), and its C-6 and/or C-7 epimeric analogs 3-5 have been synthesized from sinomenine (2). The carbonyl transposition from 9 to 8 using selenoxide chemistry proceeded in an efficient manner. Successive C-6 hydroxylation through the potassium enolate oxidation with (-)-(2S,8aR)-(camphorsulfonyl)oxaziridine (23) predominantly produced the beta-hydroxy enone 7a, which allowed access to sinococuline (1) and the 7-epi-analog 4. On the contrary, the oxidation of the lithium enolate with (+/-)-trans-2-(phenylsulfonyl)-3-phenyloxaziridine (22) resulted in predominant formation of the a-hydroxy enone 7b, which was converted to the 6-epi-analogs 3 and 5. In contrast to the marked antitumor activity of 1, analogs 3-5 showed no activity.