Aromatic [5,5]‐sigmatropic rearrangement is an appealing protocol for accessing 1,4‐substituted arenes. However, such a protocol has not been well utilized in organicsynthesis because of the difficulties in the synthesis of the substrates, selectivity issues, and limited substrate scope. Described herein is a new [5,5]‐sigmatropic reaction utilizing readily available aryl sulfoxides and allyl nitriles
芳香族[5,5] -sigmatropic重排是一种吸引人的协议,可用于访问1,4-取代的芳烃。但是,由于底物的合成困难,选择性问题以及底物范围有限,这种方案在有机合成中并未得到很好的利用。本文描述的是一种新的[5,5]-σ反应,利用易获得的芳基亚砜和烯丙基腈。该反应具有温和的反应条件,高的化学和区域选择性,出色的官能团相容性以及广泛的底物范围。计算研究表明,反应的成功可归因于重排前体的选择性亲电组装,其中线性-C = C = N-键比竞争性[3,3]更有利于[5,5]-σ重排。 ]-σ重排。
2-ALKOXYMETHYL-3-ISOALKENYL-1-METHYLCYCLOPENTENES, USE THEREOF, IN PARTICULAR AS FRAGRANCE SUBSTANCES, CORRESPONDING ARTICLES AND PRODUCTION METHODS
申请人:Panten Johannes
公开号:US20090092725A1
公开(公告)日:2009-04-09
Compounds of formula (A) are described
wherein, independently of one another, the following applies to groups R and R
1
:
R is methyl or ethyl, and
R
1
is hydrogen or methyl, wherein the meandering line shows that for
R
1
=methyl, the associated double bind is (E)- or (Z)-configured. Furthermore, methods for producing compounds of formula (A) and the use of corresponding compounds as fragrance and/or flavouring substances are described.
Carbenoid insertion into alkenylzirconocenes—a convergent synthesis of functionalised allylmetallics
作者:Alexander N. Kasatkin、Richard J. Whitby
DOI:10.1016/s0040-4039(00)01024-8
日期:2000.8
Insertion of lithium alkylcarbenoids RC(A)LiX, A= CN, P(O)(OEt)(2), SO2Ph, OMe into alkenylzirconocene chlorides derived by hydrozirconation of terminal alkynes affords functionalised allylzirconium reagents which may be further elaborated. (C) 2000 Elsevier Science Ltd. All rights reserved.
General, Stereoselective Synthesis of (<i>Z</i>)-β,γ-Unsaturated Nitriles Promoted by Samarium Diiodide
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Simal、David Santos、Nieves R. Paz
DOI:10.1021/ol801752m
日期:2008.10.16
A method to obtain (Z)-beta,gamma-unsaturated nitriles in high or good yields and with moderate or high stereoselectivity is described. The products were achieved through the photoinduced metalation of 3-acetoxy-4-chloronitriles with Sml(2). The starting compounds were readily prepared, and a mechanism is proposed to explain this stereoselective beta-elimination reaction.
USE OF 2,4'-DIMETHYLPROPIOPHENONE AS A FRAGRANCE SUBSTANCE
申请人:Kuhn Walter
公开号:US20090162308A1
公开(公告)日:2009-06-25
The use of 2,4′-dimethylpropiophenone as a fragrance substance is described, preferably as a fragrance substance for imparting, modifying and/or reinforcing one, two, three or all the odor notes floral, rosy, rose oxide-like and herbal-like, preferably both of the odor notes rose oxide-like and herbal-like.