1-(1-Benzofuran-2-yl)-2-[[2-(1-benzofuran-2-yl)-2-hydroxyethyl]-benzylamino]ethanone | 158663-82-2

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并呋喃
• 英文名称: 1-(1-Benzofuran-2-yl)-2-[[2-(1-benzofuran-2-yl)-2-hydroxyethyl]-benzylamino]ethanone
• CAS: 158663-82-2
• 化学式: C₂₇H₂₃NO₄
• 分子量: 425.484
• InChiKey: YTGLIGQHKUKPCQ-UHFFFAOYSA-N

物化性质

• 熔点：
  125-128 °C
• 沸点：
  522.5±43.0 °C(predicted)
• 密度：
  1.284±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  5.2
• 重原子数：
  32
• 可旋转键数：
  8
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.15
• 拓扑面积：
  66.8
• 氢给体数：
  1
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  1-(1-Benzofuran-2-yl)-2-[[2-(1-benzofuran-2-yl)-2-hydroxyethyl]-benzylamino]ethanone 在 palladium dihydroxide ammonium hydroxide 、 R-Alpine-Hydride 、 氢气 作用下， 以 四氢呋喃 、 甲醇 为溶剂， -98.0 ℃ 、101.33 kPa 条件下， 反应 20.0h， 生成
  参考文献：
  名称：

  Stereocontrol between Remote Atom Centers in Acyclic Substrates. Anti Addition of Hydride to 1,5-, 1,6-, and 1,7-Hydroxy Ketones

  摘要：

  For conformationally unconstrained, acyclic organic compounds, the control of stereogenic centers at remote positions of a chain, that is, at a distance of four or more atom centers, remains a challenging problem in asymmetric synthesis. We report on our studies of 1,5, 1,6, and 1,7 diastereoselectivity in hydride reductions of acyclic hydroxy amino ketones and related compounds, which were sparked by our discovery of high 1,5 diastereocontrol (>10:1) with substrates such as 17 and 23. We have been able to achieve both high 1,5- and 1,6-anti diastereocontrol in the reduction of 1,5- and 1,6-hydroxy ketone substrates, respectively. However, the level of 1,7-anti diastereocontrol with 1,7-hydroxy ketones was only moderate. More specifically, reduction of 23 to 24 with R-alpine-hydride or Zn(BH4)(2) in CH2Cl2 (predominantly) at -78 degrees C gave high 1,5-anti stereoselectivity (anti/syn = 10:1 or 13:1, respectively), and reduction of 34 to 35 with R-alpine-hydride (CH2Cl2) gave high 1,6-anti selectivity (anti/syn = 12:1, respectively), whereas reduction of 46 to 44 with R-alpine-hydride (CH2Cl2) gave only moderate 1,7-anti stereoselectivity (anti/syn = 3:1). Results for reductions of 1,5- and 1,6-hydroxy ketone substrates having the N-benzyl structural subunit replaced (i.e., 27 --> 28, 29 --> 30, 31 --> 32, 52 --> 53, 54a --> 55a, 54b --> 55b, 54c --> 55c, and 56 --> 57) clearly indicate that the stereoelectronic character of this subunit plays a critical. role in the attainment of high anti asymmetric induction. Thus, while we obtained exceptionally high 1,6-anti stereoselectivity in the reduction of the N-mesitylmethyl substrate, 54c, to 1,6-diols 55c (anti/syn = 22:1) with R-alpine-hydride at -78 degrees C in CH2Cl2, the N-methyl substrate, 54b, gave a relatively modest anti/syn ratio of 3:1. The diminished anti/syn ratio of 4:1 in the R-alpine-hydride reduction of methoxy amino ketone 50 to 51 also indicates the importance of the free hydroxyl group for attaining high 1,6-anti stereoselectivity. To rationalize the high remote anti stereocontrol in such acyclic systems, we discuss a chelation-controlled mechanism, involving external hydride addition to a bicyclic metal complex with a coordinated ketone carbonyl (e.g., 33) vs internal hydride addition to a monocyclic metal complex with an uncoordinated ketone carbonyl (e.g., 58).

  DOI：

  10.1021/jo981341m
• 作为产物：
  描述：

  1-benzofuran-2-yl-2-dibenzylamino-ethanone 在 palladium dihydroxide 盐酸 、 氢气 、 N,N-二异丙基乙胺 作用下， 以 四氢呋喃 、 甲醇 、 乙酸乙酯 为溶剂， 5.0~23.0 ℃ 、413.69 kPa 条件下， 反应 16.75h， 生成 1-(1-Benzofuran-2-yl)-2-[[2-(1-benzofuran-2-yl)-2-hydroxyethyl]-benzylamino]ethanone
  参考文献：
  名称：

  Stereocontrol between Remote Atom Centers in Acyclic Substrates. Anti Addition of Hydride to 1,5-, 1,6-, and 1,7-Hydroxy Ketones

  摘要：

  For conformationally unconstrained, acyclic organic compounds, the control of stereogenic centers at remote positions of a chain, that is, at a distance of four or more atom centers, remains a challenging problem in asymmetric synthesis. We report on our studies of 1,5, 1,6, and 1,7 diastereoselectivity in hydride reductions of acyclic hydroxy amino ketones and related compounds, which were sparked by our discovery of high 1,5 diastereocontrol (>10:1) with substrates such as 17 and 23. We have been able to achieve both high 1,5- and 1,6-anti diastereocontrol in the reduction of 1,5- and 1,6-hydroxy ketone substrates, respectively. However, the level of 1,7-anti diastereocontrol with 1,7-hydroxy ketones was only moderate. More specifically, reduction of 23 to 24 with R-alpine-hydride or Zn(BH4)(2) in CH2Cl2 (predominantly) at -78 degrees C gave high 1,5-anti stereoselectivity (anti/syn = 10:1 or 13:1, respectively), and reduction of 34 to 35 with R-alpine-hydride (CH2Cl2) gave high 1,6-anti selectivity (anti/syn = 12:1, respectively), whereas reduction of 46 to 44 with R-alpine-hydride (CH2Cl2) gave only moderate 1,7-anti stereoselectivity (anti/syn = 3:1). Results for reductions of 1,5- and 1,6-hydroxy ketone substrates having the N-benzyl structural subunit replaced (i.e., 27 --> 28, 29 --> 30, 31 --> 32, 52 --> 53, 54a --> 55a, 54b --> 55b, 54c --> 55c, and 56 --> 57) clearly indicate that the stereoelectronic character of this subunit plays a critical. role in the attainment of high anti asymmetric induction. Thus, while we obtained exceptionally high 1,6-anti stereoselectivity in the reduction of the N-mesitylmethyl substrate, 54c, to 1,6-diols 55c (anti/syn = 22:1) with R-alpine-hydride at -78 degrees C in CH2Cl2, the N-methyl substrate, 54b, gave a relatively modest anti/syn ratio of 3:1. The diminished anti/syn ratio of 4:1 in the R-alpine-hydride reduction of methoxy amino ketone 50 to 51 also indicates the importance of the free hydroxyl group for attaining high 1,6-anti stereoselectivity. To rationalize the high remote anti stereocontrol in such acyclic systems, we discuss a chelation-controlled mechanism, involving external hydride addition to a bicyclic metal complex with a coordinated ketone carbonyl (e.g., 33) vs internal hydride addition to a monocyclic metal complex with an uncoordinated ketone carbonyl (e.g., 58).

  DOI：

  10.1021/jo981341m

文献信息

• Remote acyclic diastereocontol involving a bicyclic metal chelate. High 1,5 asymmetric induction in the hydride reduction of δ-hydroxy ketones
  作者：Han-Cheng Zhang、Michael J. Costanzo、Bruce E. Maryanoff

  DOI：10.1016/s0040-4039(00)73275-8

  日期：1994.7

  A variety of reducing agents was explored to effect stereoselective reduction of acyclic δ-hydroxy ketone 3a; R-Alpine-Hydride provided high anti stereoselectivity (anti:syn = 7:1). Reduction of 3b in CH2Cl2 with R-Alpine-Hydride or Zn(BH4)2 afforded impressive anti stereoselectivity: 10:1 and 13:1, respectively. The stereochemical outcome is attributed to a bicyclic metal-chelate species (viz. 10)

  探索了多种还原剂以实现无环δ-羟基酮3a的立体选择性还原。R-高山-氢化物提供了高的抗立体选择性（anti：syn = 7：1）。用R-高山-氢化物或Zn（BH 4）2还原CH 2 Cl 2中的3b可获得令人印象深刻的抗立体选择性：分别为10：1和13：1。立体化学结果归因于双环金属螯合物物种（即10）。