通过线性炔烃束缚酮肟和乙炔基苯并氧唑啉(EBX)在连续催化条件下的反应实现了自由基[1,4]-氧原子转移。机理研究表明,O 原子转移经历了级联的 O 原子自由基环化/炔基化/N-O 键光裂解和随后的 N,O-双自由基重排。通过催化序列的多样化,在Cu/Ir光敏化和Cu的催化下,随着O原子的位移,不同地合成了一系列结构重要的3 H -pyrrol-3-ones和氯化呋喃[3,2- b ]吡咯。 /Ir光敏化/AlCl 3,分别。
Regioselective Propargylation of Aldehydes and Ketones by Electrochemical Reaction using Zinc and Aluminum Anodes
作者:Nobuhito Kurono、Kazuya Sugita、Masao Tokuda
DOI:10.1016/s0040-4020(99)01089-3
日期:2000.2
Electrochemical propargylation of aldehydes and ketones with unsubstituted or α-substituted propargylic bromides using platinum cathode and zinc anode proceeded efficiently under mild conditions to give the corresponding homopropargyl alcohols exclusively in high yields. Similar electrochemical propargylation with γ-substituted propargyl bromides gave the corresponding homoallenyl alcohols as major
A monodentate phosphine, 8-diphenylphosphino-8'-methoxy-1, 1'-binaphthyl, was shown to be active as a ligand in palladium-catalyzed reactions, including the reduction of allylic carbonates with formic acid, hydrosilylation of a terminal olefin, and hydroboration of but-1-en-3-yne, even though it has a highly hindered lone pair.
Diastereoselective access to substituted oxetanes <i>via</i> hydrosilylation–iodocyclisation of homopropargylic alcohols
作者:Dean D. Roberts、Mark G. McLaughlin
DOI:10.1039/d2cc03339a
日期:——
variety of homopropargylic alcohols and their derivatives is described. The reaction is tolerant to a variety of sterically and electronically varied substrates, affording only the E-vinyl silane as a sole regioisomer. The application of the resultant vinyl silanes towards the diastereoselective synthesis of tetrasubstituted oxetanes is demonstrated.