Generation, electrocyclic ring opening, and unprecedented conversion of a 3-acylaminoazetinone into <i>cis</i>-3,4-disubstituted azetidinones
作者:Saul Wolfe、Stephen Ro、Zheng Shi
DOI:10.1139/v01-102
日期:2001.8.1
at sulfur, followed by fragmentation into a four-membered thietanone and a four-membered 3-acylaminoazetinone. The azetinone undergoes electrocyclic ring opening, with a calculated half-life of 11 s at 40°C, to a trans-disubstituted vinyl isocyanate, but can be trapped by saturated, unsaturated allylic and benzylic alcohols to form 3,4-disubstituted azetidinones in which the cis- isomer predominates
尝试通过将适当功能化的铑卡宾插入 β-内酰胺 N??H 键来合成头孢克洛的核,从而导致对硫的攻击,然后碎裂成四元硫杂环酮和四元 3-酰基氨基氮杂环酮. 氮杂环丁酮经过电环开环,在 40°C 下的计算半衰期为 11 秒,生成反式二取代的异氰酸乙烯酯,但可以被饱和、不饱和的烯丙醇和苄醇捕获,形成 3,4-二取代的氮杂环丁酮。其中顺式异构体占优势。关键词:卡宾铑,转矩化学,氮杂环丁酮,巯基氮杂环丁酮。