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。
METHOD FOR MANUFACTURING KETONE
申请人:Kaneda Kiyotomi
公开号:US20120197036A1
公开(公告)日:2012-08-02
A method for manufacturing a ketone, includes oxidizing an internal olefin or a cyclic olefin having a functional group containing a hetero atom and one carbon-carbon double bond or more at a position other than terminals of a molecule thereof in an amide-based solvent in the presence of water, a palladium catalyst, and molecular oxygen, without oxidizing the functional group, thereby bonding an oxo group to at least one of the carbon atoms constituting the carbon-carbon double bond. The amide-based solvent is represented by formula (1):
wherein R
1
represents an alkyl group having 1 to 4 carbon atoms; R
2
and R
3
each independently represent an alkyl group having 1 to 4 carbon atoms or an aryl group; and when R
1
and R
2
are alkyl groups, R
1
and R
2
may be bonded to each other to form a ring structure.
A method for manufacturing a ketone, comprising: oxidizing an internal olefin or a cyclic olefin having a functional group containing a hetero atom and one carbon-carbon double bond or more at a position other than terminals of a molecule thereof in an amide-based solvent in the presence of water, a palladium catalyst, and molecular oxygen, without oxidizing the functional group, thereby bonding an oxo group to at least one of the carbon atoms constituting the carbon-carbon double bond, the amide-based solvent being represented by the following formula (1) :
(in the formula (1), R1 represents an alkyl group having 1 to 4 carbon atoms; R2 and R3 each independently represent an alkyl group having 1 to 4 carbon atoms or an aryl group; and when R1 and R2 are alkyl groups, R1 and R2 may be bonded to each other to form a ring structure).