반응 #2004705

반응 방정식

(R)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidine-5(6H)-thione

(R)-2-Amino-7-(2-bromo-4-fluoro-phenyl)-4-methyl-7,8-dihydro-6H-pyrido[4,3-d]pyrimidine-5-thione

O-(tert-butyldimethylsilyl)hydroxylamine

→

(R,Z)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidin-5(6H)-one O-tert-butyldimethylsilyloxime

수율 80.0%

용매

toluene

반응 조건

후처리

1. 1
   온도The mixture was cooled to r.t.
2. 2
   여과filtered through celite
3. 3
   농축Filtrate concentrated
4. 4
   기타the resulting oily residue was triturated with dry methanol
5. 5
   기타to afford a pale yellow solid
6. 6
   여과Filtered
7. 7
   기타dried

실험 절차

A mixture of (R)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidine-5(6H)-thione (31I, 366 mg, 1.0 mmol), O-(tert-butyldimethylsilyl)hydroxylamine (588 mg, 4.0 mmol), Hg(OAC)2 (640 mg, 2.0 mmol) and toluene (5 mL) was heated at 100° C. for 2 h. The mixture was cooled to r.t. and filtered through celite. Filtrate concentrated and the resulting oily residue was triturated with dry methanol to afford a pale yellow solid. Filtered and dried to afford ((R,Z)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidin-5(6H)-one O-tert-butyldimethylsilyloxime (105a, 384 mg, 80%) as a pale yellow solid. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 0.22 (s, 3H), 0.23 (s, 3H) 0.97 (s, 9H) 2.70 (s, 3H) 2.91 (dd, J=16.42, 8.08 Hz, 1H) 3.19 (ddd, J=16.36, 4.86, 1.26 Hz, 1H) 4.99 (ddd, J=7.77, 5.12, 2.02 Hz, 1H) 7.05 (td, J=8.27, 2.65 Hz, 1H) 7.33 (dd, J=8.08, 2.78 Hz, 1H) 7.39 (dd, J=8.72, 5.94 Hz, 1H). MS (ES) [M+H] calculated for C20H28BrFN5OSi, 480.12; found 480.30.

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