HERON rearrangement of N,N?-diacyl-N,N?-dialkoxyhydrazines ? a theoretical and experimental study
摘要:
Ab initio calculations at the B3LYP/6-31G* level on N-methoxy-N-dimethylaminoformamide and its rearrangement to methyl formate and 1,1-dimethyldiazene through the HERON reaction, have been carried out in conjunction with an experimental study of the HERON reactions of N,N'-diacyl-N,N'-dialkoxyhydrazines. Substituent effects are in accord with the theoretical properties of the transition state and point to an anomerically driven process in which donor groups on the anomeric nitrogen and withdrawing groups on the migrating alkoxy oxygen facilitate the rearrangement process. (C) 1999 Elsevier Science Ltd. All rights reserved.
HERON rearrangement of N,N?-diacyl-N,N?-dialkoxyhydrazines ? a theoretical and experimental study
摘要:
Ab initio calculations at the B3LYP/6-31G* level on N-methoxy-N-dimethylaminoformamide and its rearrangement to methyl formate and 1,1-dimethyldiazene through the HERON reaction, have been carried out in conjunction with an experimental study of the HERON reactions of N,N'-diacyl-N,N'-dialkoxyhydrazines. Substituent effects are in accord with the theoretical properties of the transition state and point to an anomerically driven process in which donor groups on the anomeric nitrogen and withdrawing groups on the migrating alkoxy oxygen facilitate the rearrangement process. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis and antibacterial activity of cephalosporins having hydroxamic acid at C-7 position
作者:Myoung Goo Kim、Jae Chul Jung、Moo Je Sung、Young Key Choi、Sang Geun An、Se-Jong Lee、Geal-Jung Yoon、Myung Hwan Park
DOI:10.1016/0960-894x(96)00381-2
日期:1996.9
The synthesis and in vitro activity of cephalosporins with hydroxamic acid at the 7-position are described. Anti-pseudomonal activity of the compound 11a was shown to be comparable to that of ceftazidime. Especially, the compound 11a exhibited good activity against Gram-positive bacteria including Streptococcus pneumoniae and Staphylococcus aureus. Copyright (C) 1996 Elsevier Science Ltd
COOLEY J. H.; JACOBS P. T., J. ORG. CHEM. <JOCE-AH>, 1975, 40, NO 5, 552-557
作者:COOLEY J. H.、 JACOBS P. T.
DOI:——
日期:——
HERON rearrangement of N,N?-diacyl-N,N?-dialkoxyhydrazines ? a theoretical and experimental study
作者:Stephen A. Glover、Guoning Mo、Arvi Rauk
DOI:10.1016/s0040-4020(98)01151-x
日期:1999.3
Ab initio calculations at the B3LYP/6-31G* level on N-methoxy-N-dimethylaminoformamide and its rearrangement to methyl formate and 1,1-dimethyldiazene through the HERON reaction, have been carried out in conjunction with an experimental study of the HERON reactions of N,N'-diacyl-N,N'-dialkoxyhydrazines. Substituent effects are in accord with the theoretical properties of the transition state and point to an anomerically driven process in which donor groups on the anomeric nitrogen and withdrawing groups on the migrating alkoxy oxygen facilitate the rearrangement process. (C) 1999 Elsevier Science Ltd. All rights reserved.