(2R,3R,4R)-2,4-dimethyl-5-(benzyloxy)-1,3-(isopropylidenedioxy)pentane | 138124-14-8

• 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: (2R,3R,4R)-2,4-dimethyl-5-(benzyloxy)-1,3-(isopropylidenedioxy)pentane
• 英文别名: (4R,5R)-2,2,5-trimethyl-4-[(2R)-1-phenylmethoxypropan-2-yl]-1,3-dioxane
• CAS: 138124-14-8
• 化学式: C₁₇H₂₆O₃
• 分子量: 278.392
• InChiKey: HUXCXFCCXCGDPL-IIAWOOMASA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.4
• 重原子数：
  20
• 可旋转键数：
  5
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.65
• 拓扑面积：
  27.7
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  (R)-3-benzyloxy-2-methylpropanal 在 Lindlar's catalyst 、 三氟化硼乙醚 sodium tetrahydroborate 、 二甲基硫 、 氢气 、 4-甲基苯磺酸吡啶 、 臭氧 作用下， 以 甲醇 、 二氯甲烷 、 苯 为溶剂， 反应 1.44h， 生成 (2R,3R,4R)-2,4-dimethyl-5-(benzyloxy)-1,3-(isopropylidenedioxy)pentane
  参考文献：
  名称：

  Synthesis of enantioenriched homopropargylic alcohols through diastereoselective SE' additions of chiral allenylstannanes to aldehydes

  摘要：

  Allenylstannanes (S)-4 and (R)-4, available in ca. 90% ee from alkynones 1 through reduction with the LiAlH4-Darvon alcohol or -ent-Darvon alcohol complex, followed by S(N)2' displacement on the derived mesylates (R)-3 or (S)-3 with Bu3SnLi.CuBr.Me2S, readily add to various aldehydes under Lewis acid catalysis to afford optically active homopropargylic alcohols with good to excellent syn diastereoselectivity. With 2-(benzyloxy)propanal (48), MgBr2-catalyzed reactions are highly stereoselective, affording the syn adduct 49 from the (S)-stannane (S)-4 and the anti adduct 52 from the (R)-stannane (R)-4. BF3-promoted additions give mainly or exclusively the syn adducts 49 and 51. Additions of (S)- and (R)-4 to (R)-3-(benzyloxy)-2-methylpropanal (61) yield the syn adducts 62 and 64 as major or exclusive products.

  DOI：

  10.1021/jo00030a036

文献信息

• Stereoselective total synthesis of (.+-.)-invictolide. An efficient preparation of a trisubstituted .delta.-lactone from aldol precursors
  作者：Ronaldo Aloise Pilli、Maria Marcia Murta

  DOI：10.1021/jo00054a014

  日期：1993.1

  The stereoselective total synthesis of (+/-)-invictolide (1), a component of the queen recognition pheromone of Solenopsis invicta, is described. The TiCl4-mediated addition of silyl ketene thioacetal 8 to (+/-)-3-(benzyloxy)-2-methylpropionaldehyde afforded exclusively thioester 10, in 65% yield, which was straightforwardly converted to diol 5 (ca. 31% yield). Diol 5 was also prepared after LiAlH4 reduction of the major aldol formed in the condensation between the lithium enolate of 2,6-di-tert-butyl-4-methylphenyl propanoate and (+/-)-2-methylvaleraldehyde (ca.50% overall yield). Intramolecular alkylation (t-BuOK-THF) of 6 or 7 gave a 40:60 mixture of (+/-)-1 and its C(3) epimer. Catalytic hydrogenation of unsaturated lactone 17 afforded (+/-)-1 in 80% yield.