Comparative Studies of Cathodically-Promoted and Base-Catalyzed Michael Addition Reactions of Levoglucosenone
作者:Alexander V. Samet、Murat E. Niyazymbetov、Victor V. Semenov、Andrei L. Laikhter、Dennis H. Evans
DOI:10.1021/jo961019g
日期:1996.1.1
Regioselective Michael addition of nitro and heterocyclic compounds to levoglucosenone, 1, is effectively catalyzed by amines and also by cathodic electrolysis. In comparison to the base-catalyzed reaction, it was found that under electrochemical conditions the reaction proceeds under milder conditions and with higher yields. Cathodically-initiated Michael addition of thiols to levoglucosenone using small currents
Allylic alkylations catalyzed by the couple palladium complexes-alumina
作者:D. Ferroud、J.P. Genet、J. Muzart
DOI:10.1016/s0040-4039(01)81443-x
日期:1984.1
Using both palladium complexes and alumina, nucleophilic substitution of allyl acetate by various nucleophiles (pKa = 5–13) are realized with good yields at room temperature without preformation of the corresponding carbanions.
Sterically Hindered <i>C</i><sup>α</sup><sup>,</sup><sup>α</sup>-Disubstituted α-Amino Acids: Synthesis from α-Nitroacetate and Incorporation into Peptides
作者:Yanwen Fu、Lars G. J. Hammarström、Tod J. Miller、Frank R. Fronczek、Mark L. McLaughlin、Robert P. Hammer
DOI:10.1021/jo015809o
日期:2001.10.1
demanding C(alpha,alpha)-dibenzylglycine (Dbg) has been incorporated into a peptide using solid-phase synthesis. It was found that once sterically congested Dbg is at the peptide N-terminus, further chain extension becomes very difficult using uronium or phosphonium salts (PyAOP, PyAOP/HOAt, HATU). However, preformed aminoacid symmetrical anhydride couples to N-terminal Dbg in almost quantitative yield
Method for producing polydienes and polydiene copolymers with reduced cold flow
申请人:Bridgestone Corporation
公开号:US10364300B2
公开(公告)日:2019-07-30
A method for preparing a coupled polymer, the method comprising the steps of polymerizing monomer to form a reactive polymer and reacting the reactive polymer with a carboxylic or thiocarboxylic ester containing a nitro group, where the carboxylic or thiocarboxylic ester containing a nitro group includes a single nitro group.