申请人:ELI LILLY AND COMPANY
公开号:EP0011369A1
公开(公告)日:1980-05-28
A process for preparing a 3-exomethylenecepham sulfoxide ester of the formula 2:
wherein R is the residue of a carboxylic acid and R, is a carboxylic acid protecting group, which process comprises: (a) mixing under anhydrous conditions in an inert organic solvent a 2-chlorosulfinylazetidin-4-one of the formula 1:
with stannic chloride in the presence of an oxygen compound selected from the group consisting of
and
wherein in the above formulae each R2 is independently C1-C4 alkyl; each R'2 is independently C1-C4 alkyl, C5 to C6 cycloalkyl, phenyl or phenyl substituted by C1-G4 alkyl, C3-C4 alkoxy, or halogen; z is -(CH2)m-, -CH2-CH2-Q-CH2-CH2-CH2, or -CH2-O-CH2-CH2-CH2; m is 4 or 5; and Z'is
wherein each of R2 is hydrogen or C1-C4, alkyl, and n is 3 to 6, so as to form a complex; and (b) separating the complex and decomposing it to form a compound of formula 2.
一种制备式 2 的 3-外亚甲基樟脑亚砜酯的工艺:
其中 R 是羧酸的残余物,R, 是羧酸保护基团,该工艺包括: (a) 在无水条件下,在惰性有机溶剂中将式 1.的 2-氯亚磺酰基氮杂环丁烷-4-酮与选自下列组别的氧化合物存在下的氯化锡混合; (b) 将式 2.的 2-氯亚磺酰基氮杂环丁烷-4-酮与选自下列组别的氧化合物存在下的氯化锡混合:
与氯化锡在选自以下组别的氧化合物存在下混合
和
其中在上式中,每个 R2 独立地是 C1-C4 烷基;每个 R'2 独立地是 C1-C4 烷基、C5 至 C6 环烷基、苯基或被 C1-G4 烷基、C3-C4 烷氧基或卤素取代的苯基;z 是-(CH2)m-、-CH2-CH2-Q-CH2-CH2-CH2 或-CH2-O-CH2-CH2-CH2;m 是 4 或 5;Z'是
其中 R2 均为氢或 C1-C4 烷基,n 为 3 至 6,从而形成络合物;以及 (b) 分离络合物并将其分解,形成式 2 的化合物。