4-bromo-N,N-diethyl-2-[(2R)-2-hydroxypropyl]benzamide → (3R)-6-bromo-3-methyl-3,4-dihydro-1H-isochromen-1-one

HRID 2175778

反応式

HRID 2175778 の反応式
[Br:1][C:2]1[CH:14]=[CH:13][C:5]([C:6](N(CC)CC)=[O:7])=[C:4]([CH2:15][C@H:16]([OH:18])[CH3:17])[CH:3]=1>Cl.O1CCOCC1>[Br:1][C:2]1[CH:3]=[C:4]2[C:5](=[CH:13][CH:14]=1)[C:6](=[O:7])[O:18][C@H:16]([CH3:17])[CH2:15]2

参加物

4

反応物 1

HCID 866930334-bromo-N,N-diethyl-2-[(2R)-2-hydroxypropyl]benzamide

生成物 1

HCID 71270763(3R)-6-bromo-3-methyl-3,4-dihydro-1H-isochromen-1-one

試薬・触媒・溶媒 2

HCID 313Hydrochloric Acid溶媒HCID 312751,4-Dioxane溶媒

実験手順

A solution of 4-bromo-N,N-diethyl-2-[(2R)-2-hydroxypropyl]benzamide (12.2 g, 38.8 mmol) dissolved in 4N HCl in dioxane (200 mL) was stirred at room temperature and monitored by TLC. After 3 days the reaction was partitioned between EtOAc (300 mL) and water (300 mL). The aqueous phase was further extracted with EtOAc (2×250 mL). The combined organic layers were then washed with water (200 mL), brine (200 mL), dried over magnesium sulfate, filtered and concentrated. The crude material was then purified via MPLC (15-30% EtOAc/Hexane) to afford (3R)-6-bromo-3-methyl-3,4-dihydro-1H-isochromen-1-one: 1H NMR (500 MHz; CDCl3): 7.98 (d, J=8.2 Hz, 1H), 7.56 (dd, J=1.5, 8.2 Hz, 1H), 7.45 (s, 1H), 4.71 (m, 1H), 2.94 (m, 2H), 1.55 (d, J=6.3 Hz, 3H); LC-MS: (M+1)+ 241.

後処理

  1. customAfter 3 days the reaction was partitioned between EtOAc (300 mL) and water (300 mL)
  2. extractionThe aqueous phase was further extracted with EtOAc (2×250 mL)
  3. washThe combined organic layers were then washed with water (200 mL), brine (200 mL)
  4. dry with materialdried over magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude material was then purified via MPLC (15-30% EtOAc/Hexane)

出典と根拠

ORDレコード
ord-10d94f4369b243c4a4a984d2df7137e7
出典データセット
uspto-grants-2015_06
特許番号
US09062070B2

関連ノート

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