Table 2 Synthesis of 3,4-dihydropyrimidines.

From: Synthesis of 3,4-dihydropyrimidines and octahydroquinazolinones by SBA-15 supported schiff-base iron (III) complex as durable and reusable catalyst under ultrasound irradiation

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Entry

R

Product

Yield (%)a

M.P. /M.P. (oC)b

1

4-H

>93

203-205/202-20439

2

4-Cl

>95

208-210/207-21039

3

4-OMe

≈90

198–200/203-20539

4

4-isopropyl

≈90

194-196/193-19540

5

4-NO

>95

203-205/20641

6

4-Me

≈90

206-208/20841

7

4-N(Me)2

≈90

250-252/250-25339

8

3-OH

90–92

165-167/165-16739

9

3-NO2

>90

223-225/225-22739

10

2-Cl

≈90

217-218/21841

11

2-OH

≈90

200-202/200-20239

  1. aIsolated yields.
  2. bLiterature references.
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