Lithium Hexamethyldisilazide → 6-(((tert-butyldimethylsilyl)oxy)methyl)-N-(5-cyano-4-((2-methoxyethyl)amino)pyridin-2-yl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide

HRID 1777932Notes

Reaction equation

HRID 1777932 reaction equation
[Si:1]([O:8][CH2:9][C:10]1[CH:11]=[C:12]2[C:17](=[N:18][C:19]=1[CH:20]([O:23][CH3:24])[O:21][CH3:22])[N:16]([C:25](OC1C=CC=CC=1)=[O:26])[CH2:15][CH2:14][CH2:13]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[NH2:34][C:35]1[CH:42]=[C:41]([NH:43][CH2:44][CH2:45][O:46][CH3:47])[C:38]([C:39]#[N:40])=[CH:37][N:36]=1.[Li+].C[Si]([N-][Si](C)(C)C)(C)C>C1COCC1>[Si:1]([O:8][CH2:9][C:10]1[CH:11]=[C:12]2[C:17](=[N:18][C:19]=1[CH:20]([O:21][CH3:22])[O:23][CH3:24])[N:16]([C:25]([NH:34][C:35]1[CH:42]=[C:41]([NH:43][CH2:44][CH2:45][O:46][CH3:47])[C:38]([C:39]#[N:40])=[CH:37][N:36]=1)=[O:26])[CH2:15][CH2:14][CH2:13]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:2])[CH3:3]

Participants

5

Reactant 3

HCID 2733832Lithium HexamethyldisilazideHCID 1180369516-Amino-4-(2-methoxyethylamino)pyridine-3-carbonitrile2×HCID 131734775phenyl 6-(((tert-butyldimethylsilyl)oxy)methyl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxylate2×

Product 1

HCID 1317347846-(((tert-butyldimethylsilyl)oxy)methyl)-N-(5-cyano-4-((2-methoxyethyl)amino)pyridin-2-yl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-25 °C

Procedure

A solution of phenyl 6-(((tert-butyldimethylsilyl)oxy)methyl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxylate (intermediate 38, 2.98 g, 6.29 mmol) and 6-amino-4-((2-methoxyethyl)amino)nicotinonitrile (intermediate 75, 1.10 g, 5.72 mmol) in THF (45 ml) at −70° C. (dry ice/2-PrOH bath, internal temperature) under argon was treated with LHMDS (1 M in THF, 12.6 ml, 12.6 mmol). The resulting solution was stirred with cooling for 35 min. The cooling bath was then removed and the reaction mixture was allowed to warm to −25° C., before being re-cooled to −70° C. The resulting solution was quenched with sat. aq. NH4Cl, allowed to warm to room temperature and extracted twice with EtOAc/heptanes 1:1. The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The crude material was purified by normal phase chromatography (80 g silica gel cartridge, heptanes/EtOAc 100:0 to 0:100). The product containing fractions were concentrated and dried under vacuum to give the title compound as a white solid. (UPLC-MS 3) tR 1.60; ESI-MS 571.4 [M+H]+. 1H NMR (400 MHz, CDCl3-d) δ 13.81 (s, 1H), 8.23 (s, 1H), 7.74 (s, 1H), 7.57 (s, 1H), 5.45 (s, 1H), 5.26 (br s, 1H), 4.87 (s, 2H), 4.07-3.99 (m, 2H), 3.63 (t, 2H), 3.52-3.38 (m, 11H), 2.86 (t, 2H), 2.05-1.94 (m, 2H), 0.95 (s, 9H), 0.12 (s, 6H).

Workup

  1. temperaturewith cooling for 35 min
  2. customThe cooling bath was then removed
  3. temperaturebefore being re-cooled to −70° C
  4. customThe resulting solution was quenched with sat. aq. NH4Cl
  5. temperatureto warm to room temperature
  6. extractionextracted twice with EtOAc/heptanes 1:1
  7. washThe combined organic layers were washed with brine
  8. dry with materialdried over Na2SO4
  9. filtrationfiltered
  10. concentrationconcentrated under reduced pressure
  11. customThe crude material was purified by normal phase chromatography (80 g silica gel cartridge, heptanes/EtOAc 100:0 to 0:100)
  12. additionThe product containing fractions
  13. concentrationwere concentrated
  14. customdried under vacuum

Sources & evidence

ORD record
ord-4e62b2f019bc469aaf6614989077b6a8
Source dataset
uspto-grants-2016_02
Patent number
US09266883B2

Reaction notes

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