반응 #429096

반응 방정식

NH4OH

trimethylsilyl chloride

2'-O-Propylguanosine

isobutyryl chloride

→

product

N2-Isobutyryl-2'-O-propylguanosine

용매

H2O

pyridine

반응 조건

후처리

1. 1
   workup.STIRRINGThe solution was stirred for 4 hours during which it
2. 2
   온도The solution was cooled
3. 3
   workup.STIRRINGthe solution was stirred for an additional 30 mins
4. 4
   기타the solution evaporated in vacuo
5. 5
   기타The residue was purified by silica gel chromatography
6. 6
   세척to elute the product
7. 7
   기타Product-containing fractions were evaporated

실험 절차

2'-O-Propylguanosine (3.6 gm) in pyridine (50 ml) was cooled in an ice bath and trimethylsilyl chloride (8.4 ml, 6 eq.) was added. The reaction mixture was stirred for 30 min and isobutyryl chloride (5.8 ml, 5 eq.) was added. The solution was stirred for 4 hours during which it was allowed to warm to room temperature. The solution was cooled, H2O added (10 ml) and the solution was stirred for an additional 30 mins. Concentrated NH4OH (10 ml) was added and the solution evaporated in vacuo. The residue was purified by silica gel chromatography using 10% MeOH/CH2Cl2 to elute the product. Product-containing fractions were evaporated to yield 2.5 g of product as a foam. An analytical sample was re-chromatographed on silica and eluted with CH2Cl2 →6% MeOH/CH2Cl2. 1H NMR (DMSO-d6) δ0.75 (t, 3, CH3), 1.13 [d, 6, CH(CH3)2 ], 1.4 (m, 2, CH2), 2.75 [m, 1, CH(CH3)2 ], 3.52 (m, 6, OCH2), 3.36 and 3.6 (ABX, 2, H-5'), 3.95 (m, 1), 4.26 (m, 1), 4.33 (m, 1), 5.07 (t, 1, 5'-OH), 5.18 (d, 1, 3'-OH), 5.9 (d, 1, H-1'), 8.25 (s, 1, H-8), 11.65 (br s, 1, NH) and 12.1 (br s, 1, NH). Anal. Calcd. for C17H25N5O6.1/2H2O: C, 50.49; H, 6.48; N, 17.32. Found: C, 50.81; H, 6.62; N, 17.04.

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