ChemicalBook CAS DataBase List 1 3-BIS(TERT-BUTOXYCARBONYL)GUANIDINE

1 3-BIS(TERT-BUTOXYCARBONYL)GUANIDINE synthesis

5synthesis methods

Product Name:1 3-BIS(TERT-BUTOXYCARBONYL)GUANIDINE
CAS Number:154476-57-0
Molecular formula:C11H21N3O4
Molecular Weight:259.3

24424-99-5 Synthesis

24424-99-5
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50-01-1 Synthesis

50-01-1
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$5.00/25g

154476-57-0
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$39.00/1g

Yield:154476-57-0 91%

Reaction Conditions:

with sodium hydroxide in 1,4-dioxane;lithium hydroxide monohydrate at 0 - 20; for 16 h;

Steps:

1.6 Step 6: Preparation of N,N-di-(tert-butoxycarbonyl)-guanidine as Described in Journal of Organic Chemistry, Vol. 63, No. 23, 1998

24 Guanidine chlorhydrate (7) (12.3 g, 128 mmol) and 25 sodium hydroxide (20.8 g, 519 mmol) were dissolved in 26 water (125 mL), and 27 1,4-dioxane (250 mL) were added. The mixture was cooled to 0° C. and 28 di-tert-butyl-carbonate (62.9 g, 288 mmol) was added. The mixture was allowed to warm at room temperature within 16 h. The solution was concentrated in vacuo to one-third of its initial volume. Water (150 mL) was added to the resulting mixture, and the solution was extracted with ethyl acetate (3×80 mL). The organic phase was then washed with 10% citric acid (1×100 mL), water (1×100 mL) and brine (1×100 mL), dried with anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica gel (eluent: 100% dichloromethane to 11 dichloromethane/12 methanol 95:5). The 29 di-protected guanidine was obtained as a white powder (30.54 g, 91%). ¹H NMR (300 MHz, DMSO-d₆) δ (ppm) 10.42 (s, 1H), 8.47 (s, 1H), 1.37 (s, 18H). ¹³C NMR (75.5 MHz, CDCl₃) δ (ppm) 158.3, 82.3, 28.1. IR (CHCl₃) v (cm^-1) 3407, 3124, 2976, 2930, 1792, 1641, 1549, 1453, 1397, 1365, 1248, 1153.

References:

US9809621,2017,B2 Location in patent:Page/Page column 31; 32

107819-90-9 Synthesis