(2RS,3RS)-1-(tert-butyldiphenylsilyloxy)-3-methylpent-4-en-2-ol

• 分子结构分类: 有机化合物 - 有机金属化合物 - 有机类金属化合物
• 英文名称: (2RS,3RS)-1-(tert-butyldiphenylsilyloxy)-3-methylpent-4-en-2-ol
• 英文别名: (2R,3R)-1-[tert-butyl(diphenyl)silyl]oxy-3-methylpent-4-en-2-ol
• 化学式: C₂₂H₃₀O₂Si
• 分子量: 354.565
• InChiKey: TXLABTCYHHQFFL-NQIIRXRSSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.75
• 重原子数：
  25
• 可旋转键数：
  8
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  29.5
• 氢给体数：
  1
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  (2RS,3RS)-1-(tert-butyldiphenylsilyloxy)-3-methylpent-4-en-2-ol 在 四丁基氟化铵 作用下， 以 四氢呋喃 为溶剂， 反应 1.0h， 生成 (2R,3R)-3-methylpent-4-ene-1,2-diol
  参考文献：
  名称：

  （-）-甘氨二胺的合成研究。亚基合成与偶联

  摘要：

  合成了海洋藻毒素（-）-gymnodimine的两个主要亚基。经由高立体选择性碘介导的带有双2,6-二氯苄基（DCB）醚的无环烯烃的环化反应，制备了代表毒素C10-C18的三取代四氢呋喃。在该过程中顺式-2，5-二取代的四氢呋喃的形成符合Bartlett和Rychnovsky提出的DCB基团的立体定向作用。通过将1,2,3-三取代的二烯与由麦德鲁姆酸制得的对称的亲二烯体进行狄尔斯-阿尔德环加成反应，合成了与裸草二胺的C1-C8，C19-C24部分相对应的环己烯亚基。通过与相邻醇的分子内反应以形成γ-内酯来进行环加合物中羰基的区分。E）-碘代烯烃连接在四氢呋喃区段的C16处。随后的转化将官能团定位在偶联的产物中，以用于将来的大环化事件，该事件将关闭裸草二胺的15元环。

  DOI：

  10.1021/jo062396o
• 作为产物：
  描述：

  (Z)-2,2,11,11-tetramethyl-3,3,10,10-tetraphenyl-4,9-dioxa-3,10-disiladodec-6-ene 在 臭氧 、 三苯基膦 作用下， 生成 (2RS,3RS)-1-(tert-butyldiphenylsilyloxy)-3-methylpent-4-en-2-ol
  参考文献：
  名称：

  Total Synthesis of Tautomycin

  摘要：

  A convergent stereocontrolled synthesis of the antifungal antibiotic tautomycin, a potent protein phosphatases inhibitor, has been achieved first via key aldol coupling of two large subunits, a right-hand C-1-C-21 ketone and a left-hand aldehyde (left from C-22). The C-1-C-10 segment was synthesized through a remote stereochemical control process using a spiroketal template. After joining with the C-11-C-18 segment, the spiroketal moiety was selectively constructed. Then the right-hand C-1-C-21 ketone was synthesized via Roush asymmetric crotylboration. The left-hand aldehyde was prepared from a C-21-C-26 Segment and a dialkylmaleic anhydride segment. Completely stereoselective assemblage of the two subunits, the right-hand and the left-hand, was achieved by employing the Mukaiyama aldol reaction. Further functional group manipulations including desilylation, oxidation at C-2, and deprotection of tert-butyl ester with concomitant anhydride formation provided tautomycin which was identical with the natural product. As a preliminary study, derivatizations and degradation of the natural product were also examined to support the total synthesis.

  DOI：

  10.1021/jo00121a026

文献信息

• Stereochemistry of Nucleophilic Substitution Reactions Depending upon Substituent:  Evidence for Electrostatic Stabilization of Pseudoaxial Conformers of Oxocarbenium Ions by Heteroatom Substituents
  作者：Leticia Ayala、Claudia G. Lucero、Jan Antoinette C. Romero、Sarah A. Tabacco、K. A. Woerpel

  DOI：10.1021/ja037935a

  日期：2003.12.1

  tetrahydropyran acetates reveal that the conformational preferences of six-membered-ring cations depend significantly upon the electronic nature of the substituent. Nucleophilic substitutions of C-3 and C-4 alkyl-substituted tetrahydropyran acetates proceeded via pseudoequatorially substituted oxocarbenium ions, as would be expected by consideration of steric effects. Substitutions of C-3 and C-4 alkoxy-substituted

  路易斯酸介导的取代四氢吡喃乙酸酯的亲核取代反应表明六元环阳离子的构象偏好显着取决于取代基的电子性质。C-3 和 C-4 烷基取代的四氢吡喃乙酸酯的亲核取代通过伪赤道取代的氧代碳鎓离子进行，正如考虑空间效应所预期的那样。然而，C-3 和 C-4 烷氧基取代的四氢吡喃乙酸酯的取代是通过假轴取向的氧代碳鎓离子进行的。对于一系列其他杂原子取代基，包括氮、氟、氯和溴，证明了由烷氧基控制的不寻常的选择性。由于氧代碳鎓离子的阳离子碳中心与杂原子取代基之间的静电吸引力，据信假轴构象在阳离子的基态中是优选的。该分析得到以下观察结果的支持：选择性降低了卤素系列，这与在嵌合辅助期间可能预期的电子捐赠不一致。C-2 杂原子取代系统给出了中等高的 1,2-顺式选择性，而小的烷基取代基没有显示出选择性。只有在 C-2 处的叔丁基的情况下才观察到高 1,2-反式选择性。这些研究强化了基态构象效应需要与空间方法考虑一起考虑的想法。
• Multicomponent Linchpin Couplings. Reaction of Dithiane Anions with Terminal Epoxides, Epichlorohydrin, and Vinyl Epoxides:  Efficient, Rapid, and Stereocontrolled Assembly of Advanced Fragments for Complex Molecule Synthesis
  作者：Amos B. Smith、Suresh M. Pitram、Armen M. Boldi、Matthew J. Gaunt、Chris Sfouggatakis、William H. Moser

  DOI：10.1021/ja0376238

  日期：2003.11.1

  The development, application, and advantages of a one-flask multicomponent dithiane linchpin coupling protocol, over the more conventional stepwise addition of dithiane anions to electrophiles leading to the rapid, efficient, and stereocontrolled assembly of highly functionalized intermediates for complex molecule synthesis, are described. Competent electrophiles include terminal epoxides, epichlorohydrin

  描述了单瓶多组分二噻烷关键偶联方案的开发、应用和优势，而不是将二噻烷阴离子逐步添加到亲电试剂中，从而快速、高效和立体控制地组装用于复杂分子合成的高度官能化中间体。 . 有效的亲电试剂包括末端环氧化物、表氯醇和乙烯基环氧化物。使用表氯醇和乙烯基环氧化物可以实现高化学选择性。对于乙烯基环氧化物，二噻烷阴离子的空间性质至关重要；空间上不受阻碍的二噻烷阴离子提供 S(N)2 加合物，而受阻碍的阴离子主要导致 SN2' 加合物。机理研究表明 SN2' 过程是通过对乙烯基环氧化物的顺式加成而发生的。
• Dithiane Additions to Vinyl Epoxides:  Steric Control over the S_N2 and S_N2‘ Manifolds
  作者：Amos B. Smith、Suresh M. Pitram、Matthew J. Gaunt、Sergey A. Kozmin

  DOI：10.1021/ja0283100

  日期：2002.12.1

  High chemoselectivity can be achieved in the addition of lithium dithiane anions to vinyl epoxides exploiting the steric nature of the dithiane substituent. Unencumbered dithiane anions afford SN2 adducts, whereas sterically encumbered anions lead primarily to SN2' adducts. Furthermore, the SN2' addition occurs syn to the vinyl epoxide.
• Silicon Tether-Aided Coupling Metathesis:  Application to the Synthesis of Attenol A
  作者：Pierre Van de Weghe、Darina Aoun、Jean-Guy Boiteau、Jacques Eustache

  DOI：10.1021/ol0268438

  日期：2002.11.1

  [GRAPHICS]A new synthesis of attenol A is described. Key features of this work include a crucial silicon tether-aided coupling metathesis step and the use of iodoetherification as an efficient protection method for 1,5-ene-ols.