Synthetic studies on β-lactam antibiotics. 13. Transformation of 6-epipenicillins to 2R-{(1S, 5R)-2-oxa-6-oxo-4,7- diazabicyclo[3.2.0]hept-3-en-7-yl}-3-methylbut-3-enoates
There is described a process for the preparation of a compound of the formula I
A process for the preparation of a compound of the formula I
which comprises reacting at least about 0.1 mole of triethylamine and at least about 0.1 mole of chlorotrimethylsilane per mole of 6β-acylaminopenicillin- 1β-sulfoxide compound of the following formula (II)
in a substantially anhydrous ether or hydrocarbon solvent, in which solvent the above 6β-acyhaminopenicillin-1β-sulfoxide (II) is present in a concentration of about 0.7 molar or greater, in a substantially anhydrous atmosphere at a temperature between about -20°C and about 20°C where in the above formulas R1 is hydrogen or an acyl group derived from a carboxylic acid; and R2 is an acyl group derived from a carboxylic acid; or R1 and R2 taken together with the nitrogen atom to which they are attached form a group of the formula
wherein R4 is the residue of an acyl group derived from a dicarboxylic acid; and R3 is hydrogen or a conventional carboxylic acid protecting group.
描述了一种制备式 I 化合物的工艺
一种制备式 I 化合物的工艺
其中包括使每摩尔下式(II)的 6β-乙酰氨基青霉素-1β-亚砜化合物至少约 0.1 摩尔的三乙胺和至少约 0.1 摩尔的氯三甲基硅烷反应
在基本上无水的醚或烃溶剂中,上述 6β-乙酰氨基青霉素-1β-亚砜 (II) 在溶剂中的浓度约为 0.7摩尔或更高,温度在约-20℃至约20℃之间的基本无水气氛中 其中在上述式中,R1是氢或由羧酸衍生的酰基;R2是由羧酸衍生的酰基;或 R1和R2与它们所连接的氮原子一起形成式中的基团
其中 R4 是衍生自二羧酸的酰基的残基;R3 是氢或常规的羧酸保护基团。
US4320055A
申请人:——
公开号:US4320055A
公开(公告)日:1982-03-16
Synthetic studies on β-lactam antibiotics. 13. Transformation of 6-epipenicillins to 2R-{(1S, 5R)-2-oxa-6-oxo-4,7- diazabicyclo[3.2.0]hept-3-en-7-yl}-3-methylbut-3-enoates