5-bromo-2,6,6-trimethyl-(5R)-tetrahydropyran-2-carbaldehyde | 240133-55-5

• 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: 5-bromo-2,6,6-trimethyl-(5R)-tetrahydropyran-2-carbaldehyde
• 英文别名: (2S,5R)-5-bromo-2,6,6-trimethyloxane-2-carbaldehyde
• CAS: 240133-55-5
• 化学式: C₉H₁₅BrO₂
• 分子量: 235.121
• InChiKey: QGQMRBHJXJPSAJ-APPZFPTMSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.8
• 重原子数：
  12
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.89
• 拓扑面积：
  26.3
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  5-bromo-2,6,6-trimethyl-(5R)-tetrahydropyran-2-carbaldehyde 在 草酰氯 、 二甲基亚砜 、 三乙胺 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 1.0h， 生成 1-(5-bromo-2,6,6-trimethyl-(2S,5R)-tetrahydropyran-2-yl)propenone
  参考文献：
  名称：

  从C-糖苷到吡喃吡喃：一种使用钛（III）促进的氧化还原偶联来制备噻吩酚的方法

  摘要：

  描述了一种在许多天然产物（包括甲状腺甾醇）中发现的吡喃并吡喃环系统的方法。该路线需要将香叶醇的α，β-不饱和酮（11）和乙酰乙醛二甲基乙缩醛（19）组装成二氢吡喃（23）和钛（III）促进的偶合，以得到60％的酮醇产率26。在此过程中形成的σ键对应于thyrsiferol（4）的pro-C 9 -C 10键。尝试在pro-C 11上颠倒立体化学由于邻近的TBS-醚的存在而导致的交通拥塞，使中枢受挫。因此，在Olah和Prakash及其同事开发的条件下，偶联加合物的环化反应导致了顺式吡喃吡喃[ 27]。对该晶体材料的X射线分析证实了每个立体化学分配。很大的努力后，它被确定在C羟基12可以通过用三-处理所述衍生的甲基黄原酸酯去除Ñ形成自由基的条件下丁基膦-硼烷络合物。尽管工作环境受阻，并且存在可能不稳定的C-Br键，但反应顺序仍然有效。

  DOI：

  10.1021/jo050465d
• 作为产物：
  描述：

  香叶醇 在 叔丁基过氧化氢 titanium(IV) isopropylate 、 sodium periodate 、 N-溴代丁二酰亚胺(NBS) 、 4 A molecular sieve 、 camphor-10-sulfonic acid 、 水 、 (-)-diethyl tartrate 作用下， 以 四氢呋喃 、 乙醚 、 二氯甲烷 、 甲苯 为溶剂， 反应 6.0h， 生成 5-bromo-2,6,6-trimethyl-(5R)-tetrahydropyran-2-carbaldehyde
  参考文献：
  名称：

  从C-糖苷到吡喃吡喃：一种使用钛（III）促进的氧化还原偶联来制备噻吩酚的方法

  摘要：

  描述了一种在许多天然产物（包括甲状腺甾醇）中发现的吡喃并吡喃环系统的方法。该路线需要将香叶醇的α，β-不饱和酮（11）和乙酰乙醛二甲基乙缩醛（19）组装成二氢吡喃（23）和钛（III）促进的偶合，以得到60％的酮醇产率26。在此过程中形成的σ键对应于thyrsiferol（4）的pro-C 9 -C 10键。尝试在pro-C 11上颠倒立体化学由于邻近的TBS-醚的存在而导致的交通拥塞，使中枢受挫。因此，在Olah和Prakash及其同事开发的条件下，偶联加合物的环化反应导致了顺式吡喃吡喃[ 27]。对该晶体材料的X射线分析证实了每个立体化学分配。很大的努力后，它被确定在C羟基12可以通过用三-处理所述衍生的甲基黄原酸酯去除Ñ形成自由基的条件下丁基膦-硼烷络合物。尽管工作环境受阻，并且存在可能不稳定的C-Br键，但反应顺序仍然有效。

  DOI：

  10.1021/jo050465d

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.
• From C-Glycosides to Pyranopyrans:  An Approach to Thyrsiferol Using Titanium(III)-Promoted Redox Couplings
  作者：Gisele A. Nishiguchi、R. Daniel Little

  DOI：10.1021/jo050465d

  日期：2005.6.1

  were thwarted by the congestion imparted by the presence of the vicinal TBS-ether. Consequently, cyclization of the coupling adduct under conditions developed by Olah and Prakash and co-workers led to the cis-fused pyranopyran 27. X-ray analysis of this crystalline material confirmed each of the stereochemical assignments. After much effort, it was determined that the hydroxyl group at C12 could be removed

  描述了一种在许多天然产物（包括甲状腺甾醇）中发现的吡喃并吡喃环系统的方法。该路线需要将香叶醇的α，β-不饱和酮（11）和乙酰乙醛二甲基乙缩醛（19）组装成二氢吡喃（23）和钛（III）促进的偶合，以得到60％的酮醇产率26。在此过程中形成的σ键对应于thyrsiferol（4）的pro-C 9 -C 10键。尝试在pro-C 11上颠倒立体化学由于邻近的TBS-醚的存在而导致的交通拥塞，使中枢受挫。因此，在Olah和Prakash及其同事开发的条件下，偶联加合物的环化反应导致了顺式吡喃吡喃[ 27]。对该晶体材料的X射线分析证实了每个立体化学分配。很大的努力后，它被确定在C羟基12可以通过用三-处理所述衍生的甲基黄原酸酯去除Ñ形成自由基的条件下丁基膦-硼烷络合物。尽管工作环境受阻，并且存在可能不稳定的C-Br键，但反应顺序仍然有效。