Syntheses of the D-, E-, F-, and I-Ring Parts of Ciguatoxin by a Common Strategy Starting from Tri-O-acetyl-d-glucal

Kenshu  Fujiwara; Yasuhito  Koyama; Eriko  Doi; Ken  Shimawaki; Yuko  Ohtaniuchi; Atsushi  Takemura; Shin-ichiro  Souma; Akio  Murai

doi:10.1055/s-2002-33527

LETTER

Syntheses of the D-, E-, F-, and I-Ring Parts of Ciguatoxin by a Common Strategy Starting from Tri- O -acetyl- d -glucal

Kenshu Fujiwara*^a, Yasuhito Koyama^a, Eriko Doi^a, Ken Shimawaki^a, Yuko Ohtaniuchi^a, Atsushi Takemura, Shin-ichiro Souma^a, Akio Murai*^a,b
Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
Fax: +81(11)7062714; e-Mail: fjwkn@sci.hokudai.ac.jp;
Present address: 6-14-44 Asabu-cho, Kita-ku, Sapporo 001-0045, Japan
Fax: +81(11)7476963; e-Mail: amurai@rmail.plala.or.jp;

Abstract

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Abstract

Chiral medium-sized monocyclic ethers corresponding to the D-, E-, F-, and I-ring parts of ciguatoxin have been synthesized from tri-O-acetyl-d-glucal through a common synthetic route involving ring-closing olefin metathesis.

Key words

Heterocycles - stereoselective synthesis - natural products - ethers - metathesis

Full Text

References

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Representative data for 3: a colorless oil; [α]_D ²¹ -9.2 (c 0.29, CHCl₃); ¹H NMR (400 MHz, CDCl₃, 55 °C), δ 7.28-7.48 (5 H, m, Ph), 5.74-5.82 (2 H, m, H5, H6), 5.40 (1 H, s, acetal), 4.52 (1 H, dd, J = 4.3, 10.3 Hz, H1eq), 3.77 (1 H, dd, J = 1.8, 10.6 Hz, H10a), 3.62-3.70 (2 H, m, H3, H8), 3.57 (1 H, dt, J = 4.3, 10.3 Hz, H2), 3.50 (1 H, t, J = 10.3 Hz, H1ax), 3.44 (1 H, dd, J = 7.7, 10.6 Hz, H10b), 3.32 (1 H, dt, J = 1.8, 7.7 Hz, H9), 2.68-2.80 (1 H, m, H4a), 2.44-2.58 (2 H, m, H7a, H4b), 2.28-2.43 (1 H, m, H7b), 0.91 (9 H, s, TBS), 0.90 (9 H, s, TBS), 0.098 (3 H, s, TBS), 0.070 (3 H, s, TBS), 0.066 (3 H, s, TBS), 0.049 (3 H, s, TBS); IR(film): 2955, 2928, 2856, 1471, 1462, 1389, 1361, 1294, 1258, 1213, 1148, 1103, 1027, 977, 836, 811, 776, 747, 665 cm^-1; HR-FDMS, calcd for C₂₉H₅₁O₅Si₂ (M + H)⁺: 535.3298, found: 535.3275.

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Representative data for 4: a colorless oil; [α]_D ²⁵ +13.3 (c 0.15, CHCl₃); ¹H NMR [400 MHz, C₆D₆-CDCl₃ (1:1)], δ 7.66-7.72 (4 H, m, Ph), 7.51-7.47 (2 H, m, Ph), 7.33-7.15 (9 H, m, Ph), 5.29 (1 H, s, acetal), 4.08-4.17 (1 H, m, H1eq), 3.75 (1 H, dd, J = 10.5, 5.4 Hz, H9a), 3.69 (1 H, dd, J = 10.5, 5.9 Hz, H9b), 3.50-3.59 (1 H, m, H7), 3.42-3.50 (1 H, m, H3), 3.35-3.41 (2 H, m, H1ax, H2), 3.26 (1 H, brdt, J = 8.9, 5.5 Hz, H8), 2.28 (1 H, m, 7-OH), 1.91 (1 H, brdd, J = 13.8, 3.5 Hz, H4a), 1.62-1.64 (1 H, m, H5), 1.53-1.62 (3 H, m, H4b, H6), 1.09 (9 H, s, t-Bu), 1.00 (3 H, d, J = 7.1 Hz, 5-Me); IR(film): 3490, 3071, 3047, 2928, 2857, 1589, 1455, 1428, 1391, 1372, 1292, 1215, 1112, 1029, 916, 823, 744, 701, 615 cm^-1; HR-EIMS, calcd for C₂₉H₃₃O₅Si (M - t-Bu)⁺: 489.2097, found: 489.2105.