Control of Regioselectivity in Pd(0)-Catalyzed Coupling−Cyclization Reaction of 2-(2‘,3‘-Allenyl)malonates with Organic Halides
作者:Shengming Ma、Ning Jiao、Shimin Zhao、Hairong Hou
DOI:10.1021/jo0108616
日期:2002.5.1
in the Pd(0)-catalyzed coupling-cyclization of 2-(2',3'-allenyl)malonates with organichalides is determined by the steric and electronic effects of both substrates. By deliberate control of the reaction conditions, the regioselectivity of this reaction can be tuned. With conditions A and B, the reaction afforded vinylic cyclopropane derivatives, while with conditions C and D, the reaction afforded
Reverse of Regioselectivity in Intramolecular Nucleophilic Substitution of π-Allyl Palladium Species. Highly Selective Formation of Vinylic Cyclopropanes via the Pd(0)-Catalyzed Coupling−Cyclization Reaction of Organic Iodides with 2-(2‘,3‘-Dienyl)malonates
作者:Shengming Ma、Shimin Zhao
DOI:10.1021/ol006165u
日期:2000.8.1
Vinylic cyclopropanes were formed highly selectively via the Pd(PPh(3))(4)-catalyzed insertion-intramolecular nucleophilic substitution reaction of aryl or 1-alkenyl iodides with 2-(2', 3'-dienyl)malonates. The regioselectivity observed here is different from what was reported by Cazes et al.
作者:Lina Ma、Wenjuan Li、Hui Xi、Xiaohui Bai、Enlu Ma、Xiaoyu Yan、Zhiping Li
DOI:10.1002/anie.201604349
日期:2016.8.22
carbonyl–olefin metathesis is an ongoing challenge in organic synthesis. Reported herein is an FeCl3‐catalyzedring‐closing carbonyl–olefin metathesis. The protocol allows access to a range of carbo‐/heterocyclic alkenes with good efficiency and excellent trans diastereoselectivity. The methodology presents one of the rare examples of catalytic ring‐closing carbonyl–olefin metathesis. This process is