Samarium-Promoted Coupling of Pyridine-Based Heteroaryl Analogues of Benzylic Acetates with Carbonyl Compounds
摘要:
[GRAPHICS]2-Substituted pyridine, quinoline, isoquinoline, bipyridine, and 1,10-phenanthroline analogues of benzylic acetates undergo Sml(2)-promoted coupling with aldehydes and ketones to afford (2-hydroxyalkyl)heteroaromatics.
Catalytic Asymmetric SiO Coupling of Simple Achiral Silanes and Chiral Donor-Functionalized Alcohols
作者:Andreas Weickgenannt、Marius Mewald、Thomas W. T. Muesmann、Martin Oestreich
DOI:10.1002/anie.200905561
日期:2010.3.15
Silicon alley: SiH and HOR are enantioselectively coupled in the presence of a chiral CuH complex. In this way, the kinetic resolution of racemic mixtures of alcohols is accomplished through asymmetric protection with standard silanes (see scheme; R=aryl or alkyl, Ar=3,5‐xylyl, Np=2‐naphthyl; s=selectivity factor).
硅胡同:硅 H和H 或者,对映选择性地耦合在手性铜的存在 H络合物。通过这种方式,醇的外消旋混合物的动力学拆分可通过使用标准硅烷进行不对称保护来实现(参见方案; R =芳基或烷基,Ar = 3,5-二甲苯基,Np = 2-萘基; s =选择性因子)。
AN ALDOL-TYPE REACTION OF ACTIVE METHYL GROUPS OF NITROGEN-CONTAINING HETEROAROMATIC COMPOUNDS
作者:Hiroshi Hamana、Tsutomu Sugasawa
DOI:10.1246/cl.1983.333
日期:1983.3.5
Active methyl groups of nitrogen-containing heteroaromatic compounds react with benzaldehydes in the presence of 9-BBN triflate and diisopropylethylamine in dichloromethane to give the corresponding aldol-type products under mild conditions.
Lateral metallation of methylated nitrogenous heterocycles
作者:Edwin M. Kaiser
DOI:10.1016/s0040-4020(01)91923-4
日期:1983.1
negative charge of such anions resides predominantly on the ring N atoms. The site of lithiation on pyridines and quinolines bearing Me groups in both the 2- and 4-positions depends upon the ability of the ring N atom to complex with the metallating agents. Carbanions derived from methylatedpyridines, quinolines, naphthyridines, isoquinolines, pyrido[4,3-b]carbazoles, pteridines, pyrido[3,4-b] indoles and