An efficient of Grignard-type procedure for the preparation of gem-diallylated compound
摘要:
An efficient and a new procedure for the conversion of various carboxylic acid derivatives into the corresponding gemdiallylated compound under mild reaction condition has been developed. The triallyaluminum mediated Grignard-type addition of carboxylic acid derivative was utilized as a key operation to affect the transformation. The procedure is operationally simple, giving good to excellent product yields for a broad range of substrates. The chemoselectivity and regioselectivity of triallylaluminum were also demonstrated. (C) 2007 Elsevier Ltd. All rights reserved.
Total Synthesis of Gambierol: The Generation of the A–C and F–H Subunits by Using a C-Glycoside Centered Strategy
作者:Utpal Majumder、Jason M. Cox、Henry W. B. Johnson、Jon D. Rainier
DOI:10.1002/chem.200500993
日期:2006.2.8
Gambierol, a representative of the marine ladder toxin family, consists of eight ether rings, 18 stereocenters, and two challenging pyranyl rings having methyl groups that are in a 1,3-diaxial orientation to one another. Herein we describe the generation of gambierol's A-C and F-H ring systems and demonstrate the versatility of the glycosyl anhydride, enol ether-olefin RCM strategy to fused polycyclic
Modular and Highly Stereoselective Approach to All-Carbon Tetrasubstituted Alkenes
作者:Vladislav Kotek、Hana Dvořáková、Tomáš Tobrman
DOI:10.1021/ol503624v
日期:2015.2.6
A modular and completely stereoselectiveapproach for the construction of all-carbon tetrasubstituted alkenes is described. It is based on the three-fold, sequential metal-catalyzed, cross-coupling functionalization of simple enolphosphate dibromide templates with carbon nucleophiles, affording tetrasubstituted alkenes as single isomers.
Novel and Efficient Method for the Allylation of Carbonyl Compounds and Imines Using Triallylaluminum
作者:Kao-Hsien Shen、Ching-Fa Yao
DOI:10.1021/jo052385f
日期:2006.5.1
triallylaluminum as a reagent for the allylation of carbonyl compounds and imines. The allylation of ketimines without additional metal catalyst is known so far only in the case of the Grignardreagent. Triallylaluminum is a useful alternative to provide the homoallylic amines in excellent yield upon addition to aldimines and ketimines. The significant reactivity of this reagent was confirmed by its
The reaction of 2,3-dichloro-1,4-naphthoquinone with organo aluminium, zinc, zirconium, or tin reagents yields 2-alkyl-3-chloro-1,4-naphthoquinones; with Zr or Sn reagents, palladium or nickel catalyst is needed.
On the scope of diastereoselective allylation of various chiral glyoxylic oxime ethers with allyltributylstannane in the presence of a Lewis acid and triallylaluminum
作者:Neelesh A. Kulkarni、Ching-Fa Yao、Kwunmin Chen
DOI:10.1016/j.tet.2007.05.091
日期:2007.8
The nucleophilic allylation of various chiral auxiliaries derived glyoxylic oxime ethers was studied. The use of allyltributylstannane in the presence of a Lewisacid and triallylaluminum provided the corresponding homoallylic amines in high chemical yields (up to 89%) and excellent stereoselectivities (up to >99%). The stereochemical bias of the allylation is proposed.