摘要:
A process for the preparation of 4"-deoxyerythromycins, having the formula: ##STR1## wherein R is H or OH, and R.sup.1 is H or loweralkyl by treatment of the 2'-O-acetyl-4"-imidazolylthionocarbonyl-erythromycin starting material with the radical initiator 4,4'-azobis-(4-cyanovaleric acid), H.sub.3 PO.sub.2 and an organic base in a water-miscible solvent and optionally eliminating the 2'-O-acetyl group. In a preferred embodiment, the water-miscible solvent is an alcohol and the deoxygenation and deacetylation is carried out in one step.
摘要翻译:一种制备4'-脱氧红霉素的方法,具有下式:其中R为H或OH,R1为H或低级烷基,通过处理2'-O-乙酰基-4“ - 咪唑硫代羰基 - 红霉素 起始材料与自由基引发剂4,4'-偶氮双(4-氰基戊酸),H 3 PO 2和有机碱在水混溶性溶剂中并任选除去2'-O-乙酰基。 在优选的实施方案中,水混溶性溶剂是醇,脱氧和脱乙酰化在一个步骤中进行。
摘要:
The present invention relates to a novel 6-O-methylerythromycin A crystal form, a process for preparing the crystal form, and methods for using the crystal form to prepare a 6-O-methylerythromycin A crystal form II.
摘要:
Methods and novel intermediates of the formula: wherein R6 and R7 are lower alkyl or benzyl or R6 and R7 taken together are —CH2CH2—, —CH2CH2CH2— or —CH2CH2CH2CH2CH2—, R8 is C1-C21 alkyl or a C2-C21 monounsaturated alkenyl, which may optionally be substituted with substitution substituents independently selected from the group consisting of hydroxy, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 alkoxy C1-C6 alkyl, C1-C6 alkanoyl, amino, halo, cyano, azido, oxo, mercapto and nitro, and R9 is an alcohol protecting group. The intermediates are useful for the preparation of acyclic nucleoside derivatives of the formula: where one of R1 and R2 is an amino acid acyl group and the other of R1 and R2 is a —C(O)C3-C21 saturated or monounsaturated, optionally substituted alkyl and R3 is OH or H; or a pharmaceutically acceptable salt thereof.
摘要:
The disclosed invention relates to novel 3'-N-O, 9-O-oxime protected, 6-O-alkyl erthyromycin derivatives, a process of preparing the same. The invention also relates to a process of preparing 6-O-alkyl erythromycin A by eliminating the 3'-N-oxide group and 9-O-oxime protecting groups and optionally deprotecting the hydroxy groups at the 2'- and 4"- positions under suitable reaction conditions.