Triethylamine → (S)-2-benzyl 8-tert-butyl 3-ethyl 2,8-diazaspiro[4.5]decane-2,3,8-tricarboxylate

HRID 1499128Notes

Reaction equation

[CH2:1]1[C:5]2([CH2:10][CH2:9][N:8]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:7][CH2:6]2)[CH2:4][C@@H:3]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[NH:2]1.CCN(CC)CC.Cl[C:31]([O:33][CH2:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1)=[O:32]>C(Cl)Cl>[CH2:1]1[C:5]2([CH2:6][CH2:7][N:8]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:9][CH2:10]2)[CH2:4][C@@H:3]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[N:2]1[C:31]([O:33][CH2:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1)=[O:32]

Participants

Conditions

Temperature: 0 °C

Procedure

(3S)-8-Tert-butyl 3-ethyl 2,8-diazaspiro[4.5]decane-3,8-dicarboxylate [Example 24 in US Pat. Pub. No. 2012/0101280](50 g, 160 mmol) in CH2Cl2 (500 mL), and Et3N (51.7 g, 512 mmol) was cooled to 0° C. Benzyl chloroformate (34.1 g, 205 mmol) was added dropwise and the mixture was stirred at 0° C. for 3 h. The reaction mixture was washed with water, extracted with CH2Cl2, dried over Na2SO4, and concentrated in vacuo to provide (S)-2-benzyl 8-tert-butyl 3-ethyl 2,8-diazaspiro[4.5]decane-2,3,8-tricarboxylate as a light yellow oil which was used directly without further purification.

Workup

washThe reaction mixture was washed with water
extractionextracted with CH2Cl2
dry with materialdried over Na2SO4
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-37e1f0ec694c428eac12ee83dc7b3d3d
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09199994B2

Reaction notes

Loading…