O-2-trimethylsilylphenyl N-isopropylcarbamate | 417698-17-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: O-2-trimethylsilylphenyl N-isopropylcarbamate
• 英文别名: (2-trimethylsilylphenyl) N-propan-2-ylcarbamate
• CAS: 417698-17-0
• 化学式: C₁₃H₂₁NO₂Si
• 分子量: 251.401
• InChiKey: RFRHURCXOFBINM-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.73
• 重原子数：
  17
• 可旋转键数：
  4
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.46
• 拓扑面积：
  38.3
• 氢给体数：
  1
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  O-2-trimethylsilylphenyl N-isopropylcarbamate 在 四甲基乙二胺 、 仲丁基锂 作用下， 以 乙醚 、 正戊烷 为溶剂， 反应 4.5h， 生成 2-hydroxy-3-(trimethylsilyl)benzaldehyde
  参考文献：
  名称：

  Efficient Two-Step Synthesis of Salicylaldehydes via Directed ortho-Lithiation of in situ N-Silylated O-Aryl N-Isopropylcarbamates

  摘要：

  由苯酚和异氰酸异丙酯方便制备的 O-芳基 N-异丙基氨基甲酸酯，通过高效的原位硫化工艺，可在一次反应中以高产率制备出相应的水杨醛。

  DOI：

  10.1055/s-2006-926461
• 作为产物：
  描述：

  三甲基氯硅烷 、 在 正丁基锂 、 四甲基乙二胺 、 sodium hydrogen sulfate 作用下， 以 乙醚 、 正己烷 、 正戊烷 、 水 为溶剂， 反应 2.75h， 生成 O-2-trimethylsilylphenyl N-isopropylcarbamate
  参考文献：
  名称：

  Efficient Synthesis of 2-(Trimethylsilyl)phenyl Trifluoromethanesulfonate: A Versatile Precursor to o-Benzyne

  摘要：

  An efficient procedure for the gram-scale preparation of 2-(trimethylsilyl)phenyl trifluoromethanesulfonate, a versatile precursor to o-benzyne, is presented. The three-step sequence utilizes phenol as the starting material, requires only one chromatographic purification, and ultimately delivers the desired silyltriflate in 66% overall yield.

  DOI：

  10.1021/jo9020166

文献信息

• Synthesis of Halogenated Phenols by Directed <i>ortho</i>-Lithiation and <i>ipso</i>-Iododesilylation Reactions of <i>O</i>-Aryl <i>N</i>-Isopropylcarbamates
  作者：Dieter Hoppe、Matthias Kauch

  DOI：10.1055/s-2006-926462

  日期：2006.5

  The regioselective synthesis of halogenated phenols via directed ortho-lithiation reactions of in situ N-silylated O-aryl N-isopropylcarbamates is reported. This protocol is complemented by ipso-iododesilylation reactions of C-silylated carbamates and iodine-magnesium exchange reactions, which are facilitated by the adjacent carbamoyl group. These methods provide an entry into a series of o-fluoro-

  报道了通过原位 N-甲硅烷基化 O-芳基 N-异丙基氨基甲酸酯的直接邻位锂化反应区域选择性合成卤代酚。该协议由 C-甲硅烷基化氨基甲酸酯的 ipso-iododesilylation 反应和碘-镁交换反应补充，这些反应由相邻的氨基甲酰基团促进。这些方法提供了一系列 o-fluoro- 的入口。o-iodo- 和 oo'-diiodophenols 以其他方式难以获得的高产率。
• Synthesis of substituted phenols by directed <i>ortho</i>-lithiation of in situ <i>N</i>-silyl-protected <i>O</i>-aryl <i>N</i>-monoalkylcarbamates
  作者：Matthias Kauch、Dieter Hoppe

  DOI：10.1139/v01-146

  日期：2001.11.1

  A simple, high-yield procedure has been developed for the ortho-lithiation and subsequent ortho-substitution of phenols by a manifold of electrophiles. N,C-Dilithiation of O-aryl N-monoalkylcarbamates proved to be impossible due to a cleavage reaction of the monolithiated intermediates. However, in situ N-silylation of O-aryl N-isopropylcarbamates proceeds smoothly with trialkylsilyl triflates – N,N,N',N'-tetramethylethylenediamine (TMEDA). Separation of the formed O-aryl N-isopropyl-N-trialkylsilylcarbamates from the byproduct TMEDA·HOTf, which is insoluble in diethyl ether or toluene, is not required. ortho-Lithiation with n-butyllithium–TMEDA at –78°C leads to the corresponding aryllithium, which does not undergo anionic ortho-Fries rearrangement under the reaction conditions, but is efficiently substituted by electrophilic reagents. During the aqueous work-up, the N-silyl group is removed and the corresponding ortho-substituted O-aryl N-isopropylcarbamate is isolated. Among the introduced electrophiles are: Me₃Si, Bu₃Sn, PhS, I, Br, Cl, alkyl, α-hydroxyalkyl. Liberation of the free phenols is performed under mild alkaline conditions.Key words: directed ortho-metalation, ortho-lithiated O-aryl carbamates, ortho-substituted phenols, in situ protection of N-monoalkylcarbamates.

  已开发出一种简单、高产率的程序，用于对苯酚进行正-锂化和随后的正-取代，通过一系列亲电试剂。O-芳基N-单烷基氨基甲酸酯的N,C-二锂化由于单锂化中间体的裂解反应而被证明是不可能的。然而，O-芳基N-异丙基氨基甲酸酯的原位N-硅烷基化与三烷基硅酰三氟甲烷（TMEDA）顺利进行。无需将形成的O-芳基N-异丙基-N-三烷基硅基氨基甲酸酯与副产物TMEDA·HOTf分离，后者在乙醚或甲苯中不溶。在-78°C下，使用正丁基锂-TMEDA进行正-锂化可得到相应的芳基锂，在反应条件下不会发生阴离子的正-Fries重排，但会被亲电试剂有效地取代。在水工作过程中，N-硅基团被去除，相应的正-取代的O-芳基N-异丙基氨基甲酸酯被分离出来。引入的亲电试剂包括：Me₃Si、Bu₃Sn、PhS、I、Br、Cl、烷基、α-羟基烷基。在温和的碱性条件下进行游离苯酚的操作。关键词：定向正-金属化、正-锂化O-芳基氨基甲酸酯、正-取代苯酚、原位保护N-单烷基氨基甲酸酯。