Acyclic nitronate olefin cycloaddition (ANOC): regio- and stereospecific synthesis of isoxazolines
作者:Liang Ma、Luyao Kou、Feng Jin、Xionglve Cheng、Suyan Tao、Gangzhong Jiang、Xiaoguang Bao、Xiaobing Wan
DOI:10.1039/d0sc05607c
日期:——
We report the first demonstrations of intra- and intermolecular acyclic nitronate olefin cycloaddition (ANOC) reactions that enable the highly efficient syntheses of isoxazolines bearing various functional groups. This general approach to accessing γ-lactone fused isoxazolines was hitherto unprecedented. The room temperature transformations reported herein exhibit wide substrate scopes, as evidenced
作者:Hans J. Reich、Martha J. Kelly、Richard E. Olson、Ronald C. Holtan
DOI:10.1016/s0040-4020(01)88593-8
日期:1983.1
A series of silylketones has been prepared by appropriate manipulation of ⇌-silylated allenol ethers. Among the compounds prepared were alkenyl, alkynyl and acyl silylketones. The spectroscopic properties of representative members of these classes of compounds have been measured, and some of their chemical reactions studied Diels-Alder cycloadditions of vinyl and alkynyl silylketones proceed smoothly
A short approach toward new acrolein‐type derivatives, functionalized in position 2 is described. It involves, as the key step, a smooth transformation of acylsilanes into aldehydes by irradiation in water‐organic solvent mixtures. The functionalized enals obtained by this newroute appear as versatile building blocks for the preparation of natural products and/or bioactive compounds.
Approaches to the Syntheses of 2- and 3-Phosphonomethyl Derivatives of Arabinose Via Pentacovalent Oxaphospholene Methodology
作者:Cynthia K. Mcclure、Larry A. Alegria、Todd R. Boehlow、Todd A. Madsen、Royce A. Wilkinson
DOI:10.1080/10426509908546211
日期:1999.1.1
Approaches to the syntheses of 2- and 3-phosphonomethyl derivatives of arabinose via pentacovalent oxaphospholene methodology are outlined. Condensation of the requisite pentacovalent oxaphospholenes with either a mono-protected glyoxal derivative or glyceraldehyde acetonide were highly stereoselective, producing the syn aldol product as the major isomer in both cases. The reduction of 4a to the diol
Ru-Catalyzed Synthesis of α,β-Unsaturated Acylsilanes and Its Applications in C–N Bond Formation
作者:Yongli Li、Hao Zhang、Jiawei Li、Dalong Shen、Zhenxing Liu
DOI:10.1021/acs.orglett.2c04024
日期:2022.12.16
α,β-Unsaturated acylsilanes have multifunctional sites and can be used in many transformations. However, the existing methods for preparing them generally suffer from problems, such as low atom and step economy, a narrow substrate scope, etc. Herein, an efficient and general method for accessing α,β-unsaturated acylsilanes through Ru-catalyzed cross-metathesis has been developed. This method is applied