Sodium hydride → 7-(6-hydroxycyclohex-2-enyl)hept-5Z-enoic acid

HRID 1706035

反応式

HRID 1706035 の反応式
[H-].[Na+].[H][H].[Br-].[C:6]([CH2:9][CH2:10][CH2:11][CH2:12][P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)([OH:8])=[O:7].[CH:32]12[CH2:40][CH:39](O)[O:38][CH:37]1[CH2:36][CH2:35][CH:34]=[CH:33]2>CS(C)=O.O>[OH:38][CH:37]1[CH:32]([CH2:40]/[CH:39]=[CH:12]\[CH2:11][CH2:10][CH2:9][C:6]([OH:8])=[O:7])[CH:33]=[CH:34][CH2:35][CH2:36]1

参加物

7

反応物 4

HCID 24758Sodium hydrideHCID 161236(4-Carboxybutyl)triphenylphosphonium bromideHCID 203366972,3,3a,6,7,7a-Hexahydro-1-benzofuran-2-olHCID 178418361HCID 178418361、化合物

生成物 1

HCID 705963197-(6-hydroxycyclohex-2-enyl)hept-5Z-enoic acid収率 60.9%

試薬・触媒・溶媒 2

HCID 679Dimethyl Sulfoxide溶媒2 回HCID 962Water溶媒

反応条件

温度
50 °C

実験手順

A 12.5 g (296 mmol) portion of sodium hydride (57% oil dispersion) was heated with 95 ml of dry dimethylsulfoxide (DMSO) under argon at 65°-75° C. for ca. 2.5 hours until hydrogen evolution had ceased. The mixture was stirred with ice-water cooling as 48.3 g (109 mmol) of 4-carboxybutyltriphenyl-phosphonium bromide (Aldrich) was added as a solid. The resultant deep red mixture was stirred at 0° for several minutes, then at room temperature until most of the salts had dissolved (1 hour). A solution of 12.2 g (87.1 mmol) of 7-oxabicyclo[4.3.0]non-2-en-8-ol in 10 ml of dry DMSO was added dropwise over 2 hours to the vigorously stirred solution. The resultant dark mixture was stirred for 20 hours at room temperature. Water (200 ml) was added and the resultant mixture was extracted three times with ethyl acetate and these extracts were discarded. The remaining aqueous phase was acidified with concentrated hydrochloric acid and then extracted four times with ethyl acetate. The combined extracts were dried (MgSO4) and evaporated in vacuo. The resultant residue was evaporated at 0.1 mm as the pot was warmed to 50° C. and the receiver flask was cooled in an acetone-dry ice bath. The yield of crude orange oil was 32.5 g (theoretical yield 19.5 g) and contained in addition to the desired product, considerable aromatic byproduct as evidenced from an nmr spectrum of this oil. This oil was extracted several times with warm ether-pentane (1:1). The combined extracts were dried (MgSO4) and evaporated in vacuo to give 11.9 g of 7-(6-hydroxycyclohex-2-enyl)hept-5Z-enoic acid. A portion of this product was purified by column chromatography on silicic acid-Celite (85:15) using benzene to ethyl acetate gradient elution to obtain pure 7-(6-hydroxycyclohex-2-enyl)hept-5Z-enoic acid: ir (CHCl3) 9.35, 8.08, 7.10, 6.95, 5.85, 3.40, and 2.78-4.17μ (broad); nmr δ 1.1- 2.8 (m, 13H), 2.1 (m, 1H) and 5.2-6.3 (m, 6H); ms m/e 224, 220, 206, 147, 133, 127, 119, 105, 97, 91, 80, 79 (base), 67 and 55.

後処理

  1. additionwas added as a solid
  2. dissolutionat room temperature until most of the salts had dissolved (1 hour)
  3. stirringThe resultant dark mixture was stirred for 20 hours at room temperature
  4. extractionthe resultant mixture was extracted three times with ethyl acetate
  5. extractionextracted four times with ethyl acetate
  6. dry with materialThe combined extracts were dried (MgSO4)
  7. customevaporated in vacuo
  8. customThe resultant residue was evaporated at 0.1 mm as the
  9. temperaturethe receiver flask was cooled in an acetone-dry ice bath
  10. additioncontained in addition to the desired product, considerable aromatic byproduct
  11. extractionThis oil was extracted several times with warm ether-pentane (1:1)
  12. dry with materialThe combined extracts were dried (MgSO4)
  13. customevaporated in vacuo

出典と根拠

ORDレコード
ord-a1c6feb9c0a34053a2996c2b09b62086
出典データセット
uspto-grants-1980_06
特許番号
US04206127

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