Total synthesis of (.+-.)-triptonide and (.+-.)-triptolide
Total synthesis of (.+-.)-triptonide and (.+-.)-triptolide
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DOI:
10.1021/ja00367a046
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发表时间:
1982-02
影响因子:
15
通讯作者:
L. Garver;E. E. Tamelen-E.
中科院分区:
文献类型:
--
作者:
L. Garver;E. E. Tamelen-E.
7 X, X'* 0; Y, Y'* C (SCH3) 2 octalone (3 M H2S04, THF, 25 C, 24 h, 90%) 6, 21 the reaction mixture was subjected to reactionwith carbon disulFide5 (6 equiv) in the presence of 2.5 equiv of lithium 4-methyl-2, 6-di-ieri-bu-tylphenoxide (THF, 25 C, 48 h) followed by addition of methyl iodide (6 eq, THF, 25 C, 24 h), affording the ketene dithioacetal 721 (quantitative yield after column chromatography). Subjection of 7 to the action of dimethylsulfoniummethylide6 (1: 1 Me2SO-THF,-10-25 C) followed by direct acid hydrolysis (1: 6 6 M aqueous HCl-MeOH, 25 C, 15 h) produced the unsaturated lactone 821 (84%). 7