Preparation of 8-Substituted Xanthine CVT-124 Precursor by Late Stage Pyrimidine Ring Closure
作者:R. Jason Herr、Paul F. Vogt、Harold Meckler、Michael P. Trova、Steven R. Schow、Russell C. Petter
DOI:10.1021/jo015925r
日期:2002.1.1
scaleable synthesis of the chiral xanthine CVT-124 (1, aka. BG9719), a method for the late stage pyrimidine ring closure of the nitrogen-protected endo 2-norbornenyl imidazole 3 was developed. The three-component coupling of benzylamine, 2-cyanoglycine ethyl ester (4), and methyl 5-norbornene-2-carboximidate hydrochloride (5) was demonstrated to achieve 3 in 23-46% isolated yields. The imidazole 3 was