Silver carboxylate promoted lactonization: a general method applicable to prepare medium and large-sized lactones without high dilution or slow addition
作者:Le Liu、Shimin Xu、Hongwei Zhou
DOI:10.1016/j.tet.2013.07.064
日期:2013.9
and simple operation, remains a challenging task for the organic community. We developed a ‘freshman-can-do’ protocol to medium- and large-sizedlactones, not depending on high-dilution or slow addition techniques. Application of this method for the synthesis of natural lactones or potentially pharmaceutical compounds might be useful for organic chemists and pharmacists.
Riedel,J. D., Chemisches Zentralblatt, 1912, vol. 83, # I, p. 1773
作者:Riedel,J. D.
DOI:——
日期:——
Benzoxazepinone process
申请人:Merck, Sharp & Dohme Ltd.
公开号:US04977258A1
公开(公告)日:1990-12-11
Compounds of formula III: ##STR1## wherein R.sup.1 is a 5- or 6-membered aromatic heterocyclic group; and R.sup.4 and R.sup.5 each idependently signify hydrogen, halogen, trifluoromethyl, cyano, nitro, amino or lower alkyl; are useful intermediates in a novel process for the preparation of a class of pharmacologically active compounds of formula I: ##STR2## wherein R.sup.1, R.sup.4 and R.sup.5 are as defined above; and R.sup.3 represents hydrogen or lower alkyl.