[Cl:1][C:2]1[N:3]=[C:4]([N:12]2[CH2:17][CH2:16][O:15][CH2:14][CH2:13]2)[C:5]2[S:10][CH:9]=[C:8]([CH3:11])[C:6]=2[N:7]=1.ClC1N=C(N2CCOCC2)C2SC=CC=2N=1.C(OC(C1SC=C(C)C=1N)=O)C.[Li]CCCC.[I:51]I>C1COCC1>[Cl:1][C:2]1[N:3]=[C:4]([N:12]2[CH2:13][CH2:14][O:15][CH2:16][CH2:17]2)[C:5]2[S:10][C:9]([I:51])=[C:8]([CH3:11])[C:6]=2[N:7]=1To a solution of 2-chloro-7-methyl-4-morpholinothieno[3,2-d]pyrimidine 39 (3.0 g, 11.1 mmol; prepared according to the procedure for the synthesis of 2-chloro-4-morpholin-4-yl-thieno[3,2-d]pyrimidine but commencing with 3-amino-4-methyl-thiophene-2-carboxylic acid ethyl ester) in THF (60 mL) at −78° C. was added n-BuLi (8.9 mL, 2.5 M in Et2O). The resulting slurry was warmed to −40° C. and stirred 50 min. The reaction mixture was then cooled to −78° C. and a solution of I2 (5.6 g, 22.2 mmol) in THF (30 mL) was added. The solution was warmed to room temperature and stirred 5 h. The reaction was quenched by the addition of water. The organic layer was separated and the aqueous layer was extracted with CH2Cl2. The combined organics were washed with saturated aqueous Na2S2O3, dried over Na2SO4, filtered, and concentrated in vacuo to provide 2-chloro-6-iodo-7-methyl-4-morpholinothieno[3,2-d]pyrimidine 41 (3.8 g, 84% yield).
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