Pseudopericyclic Dearomative 1,6-Cyclization of 1-(2-Pyridyl)-2-azabuta-1,3-dienes: Synthesis and Ring-Chain Valence Equilibria of 4<i>H</i>
-Pyrido[1,2-<i>a</i>
]pyrazines
作者:Ilya P. Filippov、Mikhail S. Novikov、Alexander F. Khlebnikov、Nikolai V. Rostovskii
DOI:10.1002/ejoc.202000210
日期:2020.5.22
The 1,6‐electrocyclization of 1‐(2‐pyridyl)‐2‐azabuta‐1,3‐dienes, obtained by RhII‐catalyzed reaction of pyridotriazoles with 2H‐azirines, affords stable non‐aromatic 4H‐pyrido[1,2‐a]pyrazines despite the fact that the reaction proceeds with irreversible dearomatization of the pyridine aromatic system.
通过Rh II催化的吡啶三唑与2 H叠氮基的反应获得的1-(2-吡啶基)-2-azabuta-1,3-二烯的1,6-电环化可提供稳定的非芳族4 H吡啶基[ 1,2- a ]吡嗪,尽管该反应会随着吡啶芳族体系的不可逆脱芳香化而进行。
Hydrogenation reactions of some [1,2,3]triazolo[1,5-a]pyridines and their benzo derivatives, [1,2,3]-triazolo[1,5-a]quinoline and [1,2,3]triazolo[5,1-a]isoquinoline are studied. In general, the pyridinering is more easily hydrogenated than the triazole or benzenerings.
某些[1,2,3]三唑并[1,5- a ]吡啶及其苯并衍生物,[1,2,3]-三唑并[1,5- a ]喹啉和[1,2,3]的氢化反应研究了三唑并[5,1- a ]异喹啉。通常,吡啶环比三唑或苯环更容易氢化。
Triazolopyridines. 16 1. lithiation of 3-cyano[1,2,3]triazolo[1,5-a]-pyridine
作者:Gurnos Jones、Deborah J. Mouat、Mark A. Pitman、Edward Lunt、David J. Lythgoe
DOI:10.1016/0040-4020(95)00652-o
日期:1995.10
Various methods for the synthesis of 3-cyanotriazolopyridine 8 by diazo transfer to 2-pyridylacetonitrile are described. Lithiation of the triazolopyridine 8 using LDA or TMPA followed by quenching with TMS chloride, gave the 4-mono-, the 7-mono-,and the 4,7- di TMS derivatives 14, 18, and 15, and the amidines 16 and 17, in contrast to the previously reported regiospecific attack at position 7. A Grignard reaction on compound 8 gave 3-propionyl triazolopyridine, 13.
BALLI H.; LOEW R.; MUELLER V.; REMPFLER H.; SEZEN-GEZGIN A., HELV. CHIM. ACTA <HCAC-AV>, 1978, 61, NO 1, 97-103
作者:BALLI H.、 LOEW R.、 MUELLER V.、 REMPFLER H.、 SEZEN-GEZGIN A.