Nucleophilic Substitution Reactions of Alkyl Halides by Using New Polymer-Supported Reagents Containing Hemin
作者:Kiyoshi Saito、Kaoru Harada
DOI:10.1246/bcsj.62.2562
日期:1989.8
hemin, divinylbenzene, and 2-methyl-5-vinylpyridine was synthesized by suspension copolymerization. Substitution reactions of primary, secondary, and tertiary alkylhalides with the hemin copolymer combined with cyanide, azide, and thiocyanate ions were given satisfactory yields. This reaction mechanism was revealed to be a SNi type on the basis of stereochemical study. The hemin copolymer was not only
Regioselective Radical Amino-Functionalizations of Allyl Alcohols via Dual Catalytic Cross-Coupling
作者:Zuxiao Zhang、Duong T. Ngo、David A. Nagib
DOI:10.1021/acscatal.1c00404
日期:2021.3.19
range of nucleophiles with allylalcohols has been enabled by a dual catalytic strategy. This approach entails the combined action of an Ir photocatalyst that enables mild access to N-radicals via an energy transfer mechanism, as well as a Cu complex that intercepts the ensuing alkyl radical upon cyclization. Merger of this Cu-catalyzed cross-coupling enables a broad range of nucleophiles (e.g., CN
通过双重催化策略实现了一系列亲核试剂与烯丙醇的区域选择性胺化和交叉偶联。这种方法需要 Ir 光催化剂的联合作用,通过能量转移机制可以温和地接近 N-自由基,以及在环化时拦截随后的烷基自由基的 Cu 配合物。这种Cu 催化的交叉偶联的合并使广泛的亲核试剂(例如CN、SCN、N 3、乙烯基、烯丙基)能够参与烯烃的自由基氨基官能化。值得注意的是,立体、区域和动力学探针提供了对这种基于 Cu 的自由基拦截性质的见解。
As a new type of zincate, we designed various new organozinc derivatives, Me3Zn(R)Li2 (R = Me, CN, SCN), which could be prepared in situ from lithium trimethylzincate and anion species such as methyllithium, lithium cyanide, and lithium thiocyanate. We investigated the reactivities of these zincates toward the halogen (or tellurium)−zinc exchange, Michael addition, carbozincation, and epoxide ring
New complexes of CoII, NiII and CuII with siliconisothiocyanates of the type Rx,Si(NCS)4-x, (where x = 0, 1, 2, 3) have been synthesized and characterized using elemental analyses, magnetic susceptibility measurements and spectral (electronic and infrared) data. The CoII and NiII complexes have a polymeric tetrahedral structure, whereas a tetragonal structure has been assigned to the CuII complexes
Described herein are compounds and pharmaceutical compositions containing such compounds which inhibit cystathionine-γ-lyase (CSE). Also described herein are methods for using such CSE inhibitors, alone or in combination with other compounds, for treating diseases or conditions that would benefit from CSE inhibition.