o-Xylyl bromide → (Z)-7-Chloro-5-(4-methoxyphenyl)-1-methyl-3-(2-methylbenzyl)-1H-benzo[e][1,4]diazepin-2(3H)-one

HRID 409381Notes

Reaction equation

HRID 409381 reaction equation
C(=O)=O.CC(C)=O.[Cl:8][C:9]1[CH:29]=[CH:28][C:12]2[N:13]([CH3:27])[C:14](=[O:26])[CH2:15][N:16]=[C:17]([C:18]3[CH:23]=[CH:22][C:21]([O:24][CH3:25])=[CH:20][CH:19]=3)[C:11]=2[CH:10]=1.CC([O-])(C)C.[K+].[CH3:36][C:37]1[CH:44]=[CH:43][CH:42]=[CH:41][C:38]=1[CH2:39]Br>C1COCC1>[Cl:8][C:9]1[CH:29]=[CH:28][C:12]2[N:13]([CH3:27])[C:14](=[O:26])[CH:15]([CH2:36][C:37]3[CH:44]=[CH:43][CH:42]=[CH:41][C:38]=3[CH3:39])[N:16]=[C:17]([C:18]3[CH:19]=[CH:20][C:21]([O:24][CH3:25])=[CH:22][CH:23]=3)[C:11]=2[CH:10]=1

Participants

6

Reactant 4

HCID 6992o-Xylyl bromideHCID 308581814-BENZDIAZPIN-2-ONE,1ME5-(4MEOPH)7CLHCID 18522661Acetone cardiceHCID 23665647Potassium tert-butoxide

Product 1

HCID 59594404(Z)-7-Chloro-5-(4-methoxyphenyl)-1-methyl-3-(2-methylbenzyl)-1H-benzo[e][1,4]diazepin-2(3H)-oneYield 84.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To a stirred and cooled (dry ice/acetone bath) solution of E1 (0.50 g, 1.59 mmol) in THF (8 mL) was slowly added 1 M KOtBu (2.4 mL, 2.4 mmol, 1.5 eq). The resulting deep red mixture was stirred over dry ice/acetone bath ˜10 min followed by the slow addition of a solution of 2-methylbenzyl bromide (0.46 g, 2.5 mmol, 1.5 eq) in THF (2 mL). After stirring another ˜35 min at −78° C., the reaction mixture was quenched with water and diluted with EtOAc. The organic layer was dried (Na2SO4), filtered and evaporated (rotovap, then high vacuum). Chromatography over silica gel using 20-40% EtOAc/heptane gave 0.56 g (yield of 84%) of the title product. Noting that, when using benzyl chlorides as alkylating agents, tetrabutyl ammonium iodide was added along with the alkylating agent at the low temperature. 1H NMR (300 MHz, CDCl3) δ 2.38 (s, 3H), 3.41 (s, 3H), 3.5-3.65 (m, 2H), 3.74 (dd, 1H), 3.84 (s, 3H), 6.89 (dt, 2H), 7.05-7.15 (m, 3H), 7.25-7.35 (m, 3H), 7.45-7.5 (m, 3H).

Workup

  1. stirringThe resulting deep red mixture was stirred over dry ice/acetone bath ˜10 min
  2. stirringAfter stirring another ˜35 min at −78° C.
  3. customthe reaction mixture was quenched with water
  4. additiondiluted with EtOAc
  5. dry with materialThe organic layer was dried (Na2SO4)
  6. filtrationfiltered
  7. customevaporated (rotovap

Sources & evidence

ORD record
ord-b94a2001f3bb45269e2b8d572d97555b
Source dataset
uspto-grants-2014_06
Patent number
US08759340B2

Reaction notes

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