3-甲基咪唑啉-2,4-二酮

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Prepared according to the procedure described in Example 93 using 4-hydroxy-3-methoxybenzaldehyde (3.2 g, 21 mmoles) and 3-methyl hydantoin (3.0 g, 21 mmoles). Recrystallization from ethyl acetate gave the pure product (0.7 g), mp 227°-228° C. Prepared Recrystallization from ethyl acetate

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Prepared according to the procedure described in Example 93 using 4-hydroxy-3-methoxybenzaldehyde (3.2 g, 21 mmoles) and 3-methyl hydantoin (3.0 g, 21 mmoles). Recrystallization from ethyl acetate gave the pure product (0.7 g), mp 227°-228° C. Prepared Recrystallization from ethyl acetate

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Prepared according to the procedure described in Example 93 using 4-methoxybenzaldehyde (3.4 g, 25 mmoles) and 3-methyl hydantoin (3.0 g, 21 mmoles). Recrystallization from acetonitrile gave the pure product (2.0 g), mp 221°-222° C. Prepared Recrystallization from acetonitrile

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Prepared according to the procedure described in Example 93 using 4-methoxybenzaldehyde (3.4 g, 25 mmoles) and 3-methyl hydantoin (3.0 g, 21 mmoles). Recrystallization from acetonitrile gave the pure product (2.0 g), mp 221°-222° C. Prepared Recrystallization from acetonitrile

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Prepared according to the procedure described in Example 93 using 3-methoxybenzaldehyde (3.5 ml, 28 mmoles) and 3-methyl hydantoin (3.0 g, 21 mmoles), to afford the product (3.6 g), mp 203°-205° C. Prepared

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Prepared according to the procedure described in Example 93 using 3-methoxybenzaldehyde (3.5 ml, 28 mmoles) and 3-methyl hydantoin (3.0 g, 21 mmoles), to afford the product (3.6 g), mp 203°-205° C. Prepared

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture of 2-methoxybenzaldehyde (3.4 g,25 mmoles), 3-methyl hydantoin (3.0 g, 21 mmoles), sodium acetate (6.0 g, 73 mmoles), acetic anhydride (3 ml), and acetic acid (20 ml) is stirred under an inert atmosphere and heated to reflux. After 15 hours the mixture is poured into water (200 ml), stirred, and the precipitate filtered off, rinsed three times with water and dried. Recrystallization from acetonitrile gave the pure product (3.1 g), mp 189°-190° C. heated to reflux stirred the precipitate filtered off rinsed three times with water dried Recrystallization from acetonitrile