Novel pteridines of formula (I), ##SPC1## wherein R is an optionally substituted phenoxyalkyl group, and R.sup.1 and R.sup.2 are the same or different and each is a lower alkyl group or R.sup.1 and R.sup.2, together with the carbon atom in the pteridine ring structure, form a spirocycloalkyl ring system having 4 to 6 carbon atoms outside the pteridine ring structure, And their method of preparation. The above compounds have bacteriostatic activity.
Synthesis of 1,2-Dihydroquinolines via Hydrazine-Catalyzed Ring-Closing Carbonyl-Olefin Metathesis
作者:Yunfei Zhang、Jae Hun Sim、Samantha N. MacMillan、Tristan H. Lambert
DOI:10.1021/acs.orglett.0c02116
日期:2020.8.7
The synthesis of 1,2-dihydroquinolines by the hydrazine-catalyzed ring-closing carbonyl-olefin metathesis (RCCOM) of N-prenylated 2-aminobenzaldehydes is reported. Substrates with a variety of substitution patterns are shown. With an acid-labile protecting group on the nitrogen atom, in situ deprotection and autoxidation furnish quinoline. In comparison with related oxygen-containing substrates, the
Nickel-Catalyzed Regioselective Reductive Cross-Coupling of Aryl Halides with Polysubstituted Allyl Halides in the Presence of Imidazolium Salts
作者:Hongjun Ren、Zhan Zhang、Lijun Xu、Zhengkai Chen、Zhubo Liu、Maozhong Miao、Jinyu Song
DOI:10.1055/s-0035-1560531
日期:——
The nickel-catalyzed direct reductive cross-coupling of aryl halides with readily accessible polysubstituted allyl halides provides an efficient method for preparing diverse allylated arenes under mild conditions. Both allyl bromides and allyl chlorides are compatible with the transformation.
A copper-free allylic arylation reaction between 3,3-disubstituted allylic halides and triazene-softened aryl Grignard reagents has been developed.
一种无铜的3,3-二取代烯丙基卤化物与三氮烯软化芳基格氏试剂之间的烯丙基芳基化反应已经开发出来。
Synthesis of 3,4-Disubstituted Piperidines by Carbonyl Ene and Prins Cyclizations: Switching between Kinetic and Thermodynamic Control with Brønsted and Lewis Acid Catalysts
作者:Jodi T. Williams、Perdip S. Bahia、Benson M. Kariuki、Neil Spencer、Douglas Philp、John S. Snaith
DOI:10.1021/jo052532+
日期:2006.3.1
to cis and trans 3,4-disubstituted piperidines is described. Carbonyl ene cyclization of aldehydes 4a−e catalyzed by MeAlCl2 in refluxing chloroform afforded the trans piperidines 7a−e with diastereomeric ratios of up to 93:7, while aldehyde 4f afforded solely the cis product 6f, which was resistant to isomerization to the trans isomer. It was demonstrated for 4a that the cyclization catalyzed by a