Reaction #1557

Reaction equation

6-ethyl-5-methoxycarbonylmethyl-2-phenyl-3-propargyl-4(3H)-pyrimidinone

Compound 105

6-ethyl-5-methoxycarbonylmethyl-2-phenyl-3-propargyl-4(3H)-pyrimidinone

NH4OH

→

5-aminocarbonylmethyl-6-ethyl-2-phenyl-3-propargyl-4(3H)-pyrimidinone

Solvents

THF

Conditions

Workup

1. 1
   Otherthe bulk of the THF was removed on the rotovap
2. 2
   workup.STIRRINGThe mixture was shaken with 100 mL of ethyl acetate
3. 3
   Filtrationfiltered
4. 4
   OtherThe solid collected
5. 5
   Otherwas dried in a vacuum oven at 50° C.

Procedure

To a stirred solution of 1.75 g (5.7 mmol) of 6-ethyl-5-methoxycarbonylmethyl-2-phenyl-3-propargyl-4(3H)-pyrimidinone (Compound 105) in 100 mL of THF was added 200 mL of concentrated aqueous NH4OH. The mixture was stirred for 2 weeks and the bulk of the THF was removed on the rotovap. The mixture was shaken with 100 mL of ethyl acetate and filtered. The solid collected was dried in a vacuum oven at 50° C. to afford 0.57 g of 5-aminocarbonylmethyl-6-ethyl-2-phenyl-3-propargyl-4(3H)-pyrimidinone (Compound 275), m.p. 196°-198° C. 1H-NMR (d6 -DMSO) 1.15(3H,t), 2.5(2H,q), 3.2(1H,t), 3.4(2H,s), 4.55(2H,d), 6.9(1H,br s), 7.35(1H,br s), 7.55(3H,m), 7.7(2H,m). The aqueous layer of the filtrate was extracted with two additional 100 mL portions of ethyl acetate. The combined ethyl acetate extracts were dried over MgSO4 and rotovaped to afford a further 0.54 g of Compound 275.

Source