Synthesis of and Tautomerism in 3-Acyltetramic Acids
作者:Yong-Chul Jeong、Mark G. Moloney
DOI:10.1021/jo102304y
日期:2011.3.4
carboxylic acid (R2CO2H), and the amount of DMAP. Acylation of N-acyl tetramicacids with an alkyl carboxylic acid using 1.3 equiv of DMAP (with 1.1 equiv of DCC) unexpectedly gave the 3-acyltetramicacid directly as a result of acyl migration induced by excess amounts of DMAP. On the other hand, N-unsubstituted, N-alkyl, and N-acyl tetramicacids with alkyl and aromatic carboxylic acids gave the O-acyl tetramic
已经研究了通过酰基四羧酸与羧酸的O-酰化然后酰基转移来合成3-酰基四酸(生物活性天然产物的子结构)的方法。该酰化序列由N,N′-二环己基碳二亚胺(DCC)和4-二甲基氨基吡啶(DMAP)介导,并且对氮取代基(R 1)的性质,羧酸(R 2 CO 2 H )的性质非常敏感。),以及DMAP的数量。N-酰化由于过量的DMAP引起的酰基迁移,使用1.3当量的DMAP(含1.1当量的DCC)将酰基四酸与烷基羧酸意外地直接生成了3-酰基四酸。另一方面,通过仅使用0.1当量的DMAP(具有1.1当量的DCC),将N-未取代的,N-烷基和N-酰基的四甲酸与烷基和芳族羧酸一起给出O-酰基的四甲酸。这些可以通过用过量的DMAP处理而进一步重排成酰基产物。发现这些3-酰基四酸在溶液中的互变异构平衡在很大程度上取决于氮取代基(R 1)而不是3-酰基。
3-azabicyclo[3.1.0]hexane derivatives useful in therapy
申请人:Pfizer, Inc.
公开号:US20030013875A1
公开(公告)日:2003-01-16
Compounds of formula (I), their salts and prodrugs thereof, where the substituents are as defined herein are disclosed as opiate binding agents useful in the treatment of opiate-mediated conditions. Also described are processes for making such substances.
1
Fast, Acid-Free, and Selective Lactamization of Lactones in Ionic Liquids
作者:Kristina M. Orrling、Xiongyu Wu、Francesco Russo、Mats Larhed
DOI:10.1021/jo8015264
日期:2008.11.7
A fast and acid-free one-pot 0.2-30 mmol microwave methodology for direct ionic liquid-mediated preparation of lactams from lactones and primary amines has been developed. The protocol was investigated with a wide range of primary amines and a handful of lactones, including substrates with acid-sensitive substituents. Both gamma-lactams and delta-lactams were, despite the complete absence of a Bronsted acid. obtained in useful to excellent yields after only 35 min of microwave processing.
3-AZABICYCLO[3.1.0]HEXANE DERIVATIVES AS OPIATE RECEPTORS LIGANDS
申请人:Pfizer Limited
公开号:EP1140828A1
公开(公告)日:2001-10-10
3-AZABICYCLO¬3.1.0|HEXANE DERIVATIVES AS OPIATE RECEPTORS LIGANDS