摘要 镍(II)钳形络合物[(Me N 2 N)Ni-Cl]用于催化未活化烷基卤化物的烷基-烷基和烷基-芳基的Suzuki-Miyaura偶联反应。9-烷基-9-硼环[3.3.1]壬烷和9-苯基-9-环环[3.3.1]壬烷试剂与卤代烷的偶联以中等至良好的收率实现。该反应可耐受各种有用的官能团,包括酯,醚,呋喃,硫醚,乙缩醛和Boc基团。 镍(II)钳形络合物[(Me N 2 N)Ni-Cl]用于催化未活化烷基卤化物的烷基-烷基和烷基-芳基的Suzuki-Miyaura偶联反应。9-烷基-9-硼环[3.3.1]壬烷和9-苯基-9-环环[3.3.1]壬烷试剂与卤代烷的偶联以中等至良好的收率实现。该反应可耐受各种有用的官能团,包括酯,醚,呋喃,硫醚,乙缩醛和Boc基团。
Design, Synthesis and Antiplasmodial Evaluation of Sulfoximine-triazole Hybrids as Potential Antimalarial Prototypes
作者:Tommy F. Mabasa、Babatunde Awe、Dustin Laming、Henok H. Kinfe
DOI:10.2174/1573406415666190206232308
日期:2019.8.26
of new antimalarial agents, hybrids of triazoles and other known antimalarial drugs have been reported to possess better activity than either of the parent compounds administered individually. Despite their better activity, no hybrid antimalarial drugs have been developed so far. Objective: In the hope of developing new antimalarial prototypes, we propose the design, synthesis and antimalarial evaluation
Rate constants for chalcogen group transfers in bimolecular substitution reactions with primary alkyl radicals
作者:Dennis P. Curran、Amanda A. Martin-Esker、Sung Bo Ko、Martin Newcomb
DOI:10.1021/jo00069a036
日期:1993.8
Rate constants for group transfers of the MeS, PhS, PhSe, and PhTe groups from chalcogen-substituted acetate, acetonitrile, malonate, and malononitrile compounds, from N-(phenylthio) phthalimide and from Me2S2 and Ph2S2 to primary alkyl radicals, have been determined by competition kinetics using PTOC esters as the radical precursors and competing trapping agents. Thio group transfers from malononitrile derivatives are marginally faster than the corresponding group transfer from the symmetrical disulfide, and the rate constant for PhSe group transfer from PhSeSePh is greater than those from the derivatives studied here. Substituent effects suggest that the chalcogen transfer reactions may be concerted. For three cases in which direct comparisons can be made, the rate constants for reactions of phenylchalcogenides are approximately equal to those for halogen atom transfer when the chalcogen and halide are in the same row of the periodic table and the radical resulting from displacement is the same. The rate constants reported in this work will be useful for the rational design of synthetic schemes based on homolytic group transfer chemistry.
Desulfurization with nickel and cobalt boride: scope, selectivity, stereochemistry, and deuterium-labeling studies
作者:Thomas G. Back、Denise L. Baron、Kexin Yang
DOI:10.1021/jo00061a011
日期:1993.4
A variety of organosulfur compounds containing alkylthio and arylthio groups underwent reductive desulfurization under notably mild conditions when treated with nickel boride, generated in situ from nickel chloride hexahydrate and sodium borohydride in methanol-THF(3:1). Phenyl,chloro, and ester groups are not reduced under these conditions, while iodo, bromo, nitrile, aldehyde, ketone, cyclopropane, and olefinic functions are reduced either completely or partially. Deuterium-labeling studies indicate that the hydrogen that is incorporated into the product originates from both the sodium borohydride and the protic solvent, suggesting the intermediacy of dihydrogen. The epimers 3alpha- and 3beta-(phenylthio)cholestane afforded 3alpha- and 3beta-deuteriocholestane, respectively, demonstrating that the reaction proceeds with retention of configuration. The method may thus be employed for the stereospecific preparation of deuterated products from organosulfur compounds. Arguments are presented in support of a tentative mechanism involving an oxidative addition-reductive elimination sequence via a nickel hydride intermediate.
Jones; Reid, Journal of the American Chemical Society, 1938, vol. 60, p. 2454
作者:Jones、Reid
DOI:——
日期:——
Takahashi,K. et al., Chemical and pharmaceutical bulletin, 1960, vol. 8, p. 757 - 762