[(2R,4aS,6R,8aR)-2-[(2S,5R)-5-bromo-2,6,6-trimethyloxan-2-yl]-4a-methyl-3,4,6,7,8,8a-hexahydro-2H-pyrano[3,2-b]pyran-6-yl]methanol | 240133-54-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 氧烷类
• 英文名称: [(2R,4aS,6R,8aR)-2-[(2S,5R)-5-bromo-2,6,6-trimethyloxan-2-yl]-4a-methyl-3,4,6,7,8,8a-hexahydro-2H-pyrano[3,2-b]pyran-6-yl]methanol
• CAS: 240133-54-4
• 化学式: C₁₈H₃₁BrO₄
• 分子量: 391.346
• InChiKey: YUKVYVMJXNLQCA-CNGUFQHNSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  23
• 可旋转键数：
  2
• 环数：
  3.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  47.9
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  [(2R,4aS,6R,8aR)-2-[(2S,5R)-5-bromo-2,6,6-trimethyloxan-2-yl]-4a-methyl-3,4,6,7,8,8a-hexahydro-2H-pyrano[3,2-b]pyran-6-yl]methanol 在 palladium on activated charcoal chromium dichloride 、 氢气 、 碳酸氢钠 、 potassium carbonate 、 戴斯-马丁氧化剂 、 nickel dichloride 作用下， 以 四氢呋喃 、 甲醇 、 乙醚 、 二氯甲烷 、 二甲基亚砜 、 乙酸乙酯 为溶剂， -78.0~20.0 ℃ 、101.33 kPa 条件下， 反应 42.0h， 生成 (+)-Thyrsiferol
  参考文献：
  名称：

  Total Synthesis of Thyrsiferyl 23-Acetate, a Specific Inhibitor of Protein Phosphatase 2A and an Anti-Leukemic Inducer of Apoptosis

  摘要：

  A convergent synthetic entry to the squalenoid polyether system has been developed and applied to the biologically active marine natural products thyrsiferyl 23-acetate (la), thyrsiferol (Ib), thyrsiferyl 18-acetate (Ic), and thyrsiferyl 18,23-diacetate (Id). This involved the separate construction of two advanced intermediates representing the C1-C15 (4) and C16-C24 (5) domains, followed by their organochromium-mediated coupling, installation of the tertiary alcohol at C15, and manipulation of the C18 and C23 acetate moieties. The C1-C15 (4) intermediate containing the three tetrahydropyranyl rings (A-B-C) was derived from two preconstructed tetrahydropyran-containing units representing the functionalized A (C2-C6) and C (C10-C14) rings (6 and 7, respectively). The bromotetrahydropyranyl A ring was obtained via bromoetherification of the hydroxyalkene 16, which was synthesized from (2R,3R)-epoxy geraniol. The C ring was stereoselectively constructed by acid-catalyzed opening of the hydroxy epoxide 32, derived from D-glutamic acid. Intermediates 6 and 7 were-joined using organochromium conditions, and ketone and hydroxyl functionalities were installed at carbons:7 and 11, respectively. Closure of the B ring was accomplished stereoselectively by formation of species derived from a C7, C11 keto-alcohol and in situ reduction of a tetrahydropyranyl oxonium. The complementary tetrahydrofuran D (C19-C22) ring was obtained from a geraniol-derived tertiary hydroxy alkene (44) via a stereoselective Re(VII)-induced syn-oxidative cyclization. The side chain appended to the D ring was elaborated into trans-alkenyl iodide 5 under Takai reaction conditions. CrCl2-mediated coupling of aldehyde 4 containing the secondary bromide at C3 of the natural products, with iodide 5 bearing acetate moieties at C18 and C23, installed the C15-C16 carbon-carbon bond. The resultant C15 allylic carbinol was converted into an cr,P-saturated ketone, and the final methyl group was added stereoselectively using methylmagnesium bromide. Saponification of the C18 acetate yielded la, whereas cleavage of both C18 and C23 acetates gave the triol Ib. This modular entry into the squalenoid-polyether system may facilitate further evaluation of the antileukemic, apoptosis-inducing, protein serine/threonine phosphatase 2A inhibitory and anti-multidrug resistance activities of the thyrsiferol-derived natural products.

  DOI：

  10.1021/ja000001r
• 作为产物：
  描述：

  (S)-芳樟醇 在 palladium dihydroxide chromium dichloride 、 三乙基硅烷 、 manganese(IV) oxide 、 三氟甲磺酸三甲基硅酯 、 2,2,4,6-tetrabromocyclohexa-2,5-dienone 、 氢气 、 nickel dichloride 作用下， 以 甲醇 、 硝基甲烷 、 正己烷 、 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， -35.0~20.0 ℃ 、101.33 kPa 条件下， 反应 43.5h， 生成 [(2R,4aS,6R,8aR)-2-[(2S,5R)-5-bromo-2,6,6-trimethyloxan-2-yl]-4a-methyl-3,4,6,7,8,8a-hexahydro-2H-pyrano[3,2-b]pyran-6-yl]methanol
  参考文献：
  名称：

  Total Synthesis of Thyrsiferyl 23-Acetate, a Specific Inhibitor of Protein Phosphatase 2A and an Anti-Leukemic Inducer of Apoptosis

  摘要：

  A convergent synthetic entry to the squalenoid polyether system has been developed and applied to the biologically active marine natural products thyrsiferyl 23-acetate (la), thyrsiferol (Ib), thyrsiferyl 18-acetate (Ic), and thyrsiferyl 18,23-diacetate (Id). This involved the separate construction of two advanced intermediates representing the C1-C15 (4) and C16-C24 (5) domains, followed by their organochromium-mediated coupling, installation of the tertiary alcohol at C15, and manipulation of the C18 and C23 acetate moieties. The C1-C15 (4) intermediate containing the three tetrahydropyranyl rings (A-B-C) was derived from two preconstructed tetrahydropyran-containing units representing the functionalized A (C2-C6) and C (C10-C14) rings (6 and 7, respectively). The bromotetrahydropyranyl A ring was obtained via bromoetherification of the hydroxyalkene 16, which was synthesized from (2R,3R)-epoxy geraniol. The C ring was stereoselectively constructed by acid-catalyzed opening of the hydroxy epoxide 32, derived from D-glutamic acid. Intermediates 6 and 7 were-joined using organochromium conditions, and ketone and hydroxyl functionalities were installed at carbons:7 and 11, respectively. Closure of the B ring was accomplished stereoselectively by formation of species derived from a C7, C11 keto-alcohol and in situ reduction of a tetrahydropyranyl oxonium. The complementary tetrahydrofuran D (C19-C22) ring was obtained from a geraniol-derived tertiary hydroxy alkene (44) via a stereoselective Re(VII)-induced syn-oxidative cyclization. The side chain appended to the D ring was elaborated into trans-alkenyl iodide 5 under Takai reaction conditions. CrCl2-mediated coupling of aldehyde 4 containing the secondary bromide at C3 of the natural products, with iodide 5 bearing acetate moieties at C18 and C23, installed the C15-C16 carbon-carbon bond. The resultant C15 allylic carbinol was converted into an cr,P-saturated ketone, and the final methyl group was added stereoselectively using methylmagnesium bromide. Saponification of the C18 acetate yielded la, whereas cleavage of both C18 and C23 acetates gave the triol Ib. This modular entry into the squalenoid-polyether system may facilitate further evaluation of the antileukemic, apoptosis-inducing, protein serine/threonine phosphatase 2A inhibitory and anti-multidrug resistance activities of the thyrsiferol-derived natural products.

  DOI：

  10.1021/ja000001r

文献信息

• Novel Synthesis of the C1−C15 Polyether Domain of the Thyrsiferol and Venustatriol Natural Products
  作者：Isabel C. González、Craig J. Forsyth

  DOI：10.1021/ol990648k

  日期：1999.7.1

  [GRAPHICS]A convergent construction of the C1-C15 domain of the thyrsiferol-related natural products has been developed, This involved the separate construction of C1-C7 and C8-C15 fragments, their organochromic-mediated coupling, and subsequent reductive closure of the a ring. This synthetic A-B-C ring construct will be useful for the total synthesis of the biologically active polyether squalenoid natural products, as well as their non-natural analogues.
• Total Synthesis of Thyrsiferyl 23-Acetate, a Specific Inhibitor of Protein Phosphatase 2A and an Anti-Leukemic Inducer of Apoptosis
  作者：Isabel C. González、Craig J. Forsyth

  DOI：10.1021/ja000001r

  日期：2000.9.1

  A convergent synthetic entry to the squalenoid polyether system has been developed and applied to the biologically active marine natural products thyrsiferyl 23-acetate (la), thyrsiferol (Ib), thyrsiferyl 18-acetate (Ic), and thyrsiferyl 18,23-diacetate (Id). This involved the separate construction of two advanced intermediates representing the C1-C15 (4) and C16-C24 (5) domains, followed by their organochromium-mediated coupling, installation of the tertiary alcohol at C15, and manipulation of the C18 and C23 acetate moieties. The C1-C15 (4) intermediate containing the three tetrahydropyranyl rings (A-B-C) was derived from two preconstructed tetrahydropyran-containing units representing the functionalized A (C2-C6) and C (C10-C14) rings (6 and 7, respectively). The bromotetrahydropyranyl A ring was obtained via bromoetherification of the hydroxyalkene 16, which was synthesized from (2R,3R)-epoxy geraniol. The C ring was stereoselectively constructed by acid-catalyzed opening of the hydroxy epoxide 32, derived from D-glutamic acid. Intermediates 6 and 7 were-joined using organochromium conditions, and ketone and hydroxyl functionalities were installed at carbons:7 and 11, respectively. Closure of the B ring was accomplished stereoselectively by formation of species derived from a C7, C11 keto-alcohol and in situ reduction of a tetrahydropyranyl oxonium. The complementary tetrahydrofuran D (C19-C22) ring was obtained from a geraniol-derived tertiary hydroxy alkene (44) via a stereoselective Re(VII)-induced syn-oxidative cyclization. The side chain appended to the D ring was elaborated into trans-alkenyl iodide 5 under Takai reaction conditions. CrCl2-mediated coupling of aldehyde 4 containing the secondary bromide at C3 of the natural products, with iodide 5 bearing acetate moieties at C18 and C23, installed the C15-C16 carbon-carbon bond. The resultant C15 allylic carbinol was converted into an cr,P-saturated ketone, and the final methyl group was added stereoselectively using methylmagnesium bromide. Saponification of the C18 acetate yielded la, whereas cleavage of both C18 and C23 acetates gave the triol Ib. This modular entry into the squalenoid-polyether system may facilitate further evaluation of the antileukemic, apoptosis-inducing, protein serine/threonine phosphatase 2A inhibitory and anti-multidrug resistance activities of the thyrsiferol-derived natural products.