Acetaldehyde → HCID 16659310, compound

HRID 990926Notes

Reaction equation

[N+:1]([C:4]1[CH:13]=[CH:12][C:7]2[NH:8][CH2:9][CH2:10][O:11][C:6]=2[CH:5]=1)([O-:3])=[O:2].[CH:14](=O)[CH3:15].[BH3-]C#N.[Na+]>>[CH2:14]([N:8]1[C:7]2[CH:12]=[CH:13][C:4]([N+:1]([O-:3])=[O:2])=[CH:5][C:6]=2[O:11][CH2:10][CH2:9]1)[CH3:15]

Participants

Reactant 3

HCID 177Acetaldehyde

HCID 5003444Sodium cyanoborohydride

HCID 184161517-Nitro-3,4-dihydro-2H-1,4-benzoxazine

Product 1

HCID 16659310HCID 16659310, compoundYield 74%

Procedure

This compound was prepared by General Method 3 (EXAMPLE 1) from 3,4-dihydro-7-nitro-2H-1,4-benzoxazine (EXAMPLE 1) (1.15 g, 6.39 mmol), acetaldehyde (3.59 mL, 64.2 mmol) and NaBH3CN (1.95 g, 31 mmol) to afford 984 mg (74%) of 4-ethyl-3,4-dihydro-7-nitro-2H-1,4-benzoxazine, a yellow solid. Data for 4-ethyl-3,4-dihydro-7-nitro-2H-1,4-benzoxazine: Rf 0.85 (11.5:1 CH2Cl2:MeOH); 1H NMR (400 MHz, CDCl3) δ 7.81 (dd, 1H, J=9.6, 2.6), 7.66 (d, 1H, J=2.7), 6.29 (d, 1H, J=9.2), 4.23 (t, 2H, J=4.7), 3.47 (t, 2H, J=4.7), 3.45 (q, 2H, J=7.2), 1.22 (t, 3H, J=7.0).

Sources & evidence

ORD record: ord-37648e5e3aca42bbbd2a72f4100d0c4d
Source dataset: uspto-grants-2002_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06462038B1

Reaction notes

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