Patent ID: 7405294

Claim:
An isolated salt as set forth in formula (I) wherein R 1 is hydrogen or an amino-protecting group, selected from formyl, an alkyl- or aryl-oxycarbonyl group, or a trityl group wherein each benzene ring is optionally substituted with one or more methoxy and/or methyl groups: R 2 is a hydroxy-protecting group selected from a straight or branched C 1 -C 6 alkyl group, a benzyl, benzhydryl or trityl group wherein each benzene ring is optionally substituted with one or more methoxy, nitro and/or methyl groups; B is ammonia or an organic base selected from primary amines, secondary amines, tertiary amines, guanidine, amidines or an adduct thereof, wherein said adduct is a complex of said salt and a compound represented as H-Z, wherein H is hydrogen; and Z is selected from —S-mercaptobenzothiazolyl, —O—P + (Ph) 3 Cl − , —O—C(O)OEt, —O-benzotriazol-1-yl, —S-(2-methyl-thiadiazol-5-yl) and —O—CH═N + (CH 3 ) 2 Cl − or benzotriazol-1-yl-3-oxide; and wherein the salt is isolated from a reaction medium.