95g 7 08 mmol was treated with liquid ammonia and heated to 100 u00b0 c in a stainless steel bomb for 8 hours the products of this reaction were worked up and purified on silica gel 80 g as described in example 1 the deprotected compound 5 allyl cyano methyl 1 2 39 deoxy u03b2 d erythro pentofuranosyl imidazole 4 carboxamide was isolated as a white foam 1 3 g 58 1 h nmr u03b4 8 09 and 8 05 s s 1 h h 2 6 15 t 1 h h1 39 5 75 and 5 10 2 m 3 h vinyl 5 42 and 5 34 t t 1 h methene anal calcd for c 14 h 18 n 4 o 4 306 33 c 54 89 h 5 92 n 18 29 found c 54 58 h 5 92 n 17 93 the nucleoside methyl 5 benzyl cyano methyl 1 2 39 deoxy 3 5di o p toluoyl u03b2 d erythro pentofuranosyl imidazole 4 carboxylate 3 0 g 4 93 mmol was treated with liquid ammonia and heated to 100 u00b0 c in a stainless steel bomb for 6 hours the products of this reaction were worked up and purified on silica gel 80 g as described in example 1 the deprotected compound 5 benzyl cyano methyl 1 2 39 u03b2 d erythro pentofuranosyl imidazole 4 carboxamide was isolated as a white foam 1 0 g 59 1 h.