Development of a Formal Catalytic Asymmetric [4 + 2] Addition of Ethyl-2,3-butadienoate with Acyclic Enones
作者:Kumar Dilip Ashtekar、Richard J. Staples、Babak Borhan
DOI:10.1021/ol202301f
日期:2011.11.4
Allene esters are unique not only as excellent electrophiles but also because of their ability for subsequent reactivity after the initial nucleophilic attack. A mechanistically inspired cyclization using ethyl-2,3-butadienoate and acyclic enones to provide dihydropyrans In excellent yields and enantioselectivity under solvent-free conditions at room temperature is reported.
AROMATIC HETEROCYCLIC DERIVATIVE, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENT, AND ORGANIC ELECTROLUMINESCENT ELEMENT
申请人:IDEMITSU KOSAN CO., LTD.
公开号:US20140312338A1
公开(公告)日:2014-10-23
An aromatic heterocyclic derivative is represented by a formula (1) below.
In the formula (1), X
1
to X
3
each are a nitrogen atom or CR
1
, with a proviso that at least one of X
1
to X
3
is a nitrogen atom. A is represented by a formula (2) and B is represented by a formula (4) below.