A facile conversion of the phenylthio group to acetoxy by copper reagents for a practical synthesis of 4-acetoxyazetidin-2-one derivatives from (R)-butane-1,3-diol
作者:Takashi Nakatsuka、Hiromitsu Iwata、Rie Tanaka、Seiichi Imajo、Masaji Ishiguro
DOI:10.1039/c39910000662
日期:——
(3S,4R,1′R)-4-Acetoxy-3-(1′-tert-butyldimethylsilyloxyethyl)-azetidin-2-one 8, an important intermediate for the synthesis of penem and carbapenem antibiotics, was synthesized from (R)-butane-1,3-diol 1, using chlorosulphonyl isocyanate for the formation of β-lactam ring in which a significant solvent effect on the ratio of diastereoisomers 6a and 6b was observed; copper(II) acetate rather than the
(3小号,4 - [R,1' - [R)-4-乙酰氧基-3-(1'-叔-butyldimethylsilyloxyethyl) -氮杂环丁-2-酮8,对于青霉烯和碳代青霉烯抗菌素的合成中的重要中间体,由(R)-丁烷-1,3-二醇1,使用氯磺酰基异氰酸酯形成β-内酰胺环,其中观察到对非对映异构体6a和6b的比例具有显着的溶剂作用;使用乙酸铜(II)而不是有毒的乙酸汞(II)将化合物6a的苯硫基转化为乙酰氧基。