14 新規免疫抑制活性物質mycestericin類D,E,FおよびGの絶対配置の決定と全合成(口頭発表の部)

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概要

• 論文の詳細を見る

• Mycestericins D (1), E (3), F (2) and G (4), new immunosuppressants, were isolated from the culture broth of Mycelia sterilia ATCC 20349. The immunosuppressive activities of 1 and 2 exhibited an IC_<50> of 16nM and 120nM against mouse allogeneic mixed lymphocyte reaction (MLR), respectively, while 3 and 4 exhibited an IC_<50> of 13nM and 370nM, respectively. The proposed structures were unambiguously confirmed by spectroscopy, chemical evidence and total synthesis. Their absolute configurations have been determined by comparison of their CD spectra with those of synthetic compounds (R and S)-9 prepared from methyl (2S, 4R)-2-tert-butyl-3-formyl-oxazolidine-4-carboxylate (5) and stearoyl chloride. Thus, mycestericins D (1) and F (2) were assigned to be 2 (S), 3 (S) configurations, while mycestericins E (3) and G (4) were 2 (S), 3 (R) configurations. The first total synthesis of mycestericins have been achieved from 5 and 1,8-octanediole (10). The alkyl chain moiety 21 was prepared in 12 steps from 10 by straightforward reactioin. The key intermediate 22 obtained from 5 and 21 could be converted to the desired final compounds. Stereoselective reduction of the ketone 22 with Zn(BH_4)_2 or NaBH_4 provided the (R)-hydroxy 23, the protecting groups of which were removed with 10% MeOH in CF_3COOH, followed by hydrolysis of 24 to give mycestericin E (3). On the other hand, mycestericin D (1) was synthesized from 22 by deprotection, followed by reduction of 25 with Me_4NBH(OAc)_3 and then hydrolysis of 26. Hydrogenation of mycestericin D (1) and E (3) provided the corresponding F (2) and G (4).

• 天然有機化合物討論会の論文
• 1995-09-01

著者

• 藤多 哲朗

  摂南大学薬学部

• 藤多 哲朗

  摂南大・薬

• 藤多 哲朗

  摂南大薬

• 浜道 則光

  摂南大薬

• 広瀬 良治

  台糖研

• 松崎 徹

  京大薬

• 北尾 有紀

  京大薬

• 城内 正寿

  京大薬

• 城内 正寿

  Institute Of Chemistry And Cell Biology Harvard Medical School

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