from 3,5‐dimethoxybenzaldehyde, some functionalized 2,3,4‐trisubstituted tricyclic 4,5‐cycloalkyl‐fused and 6‐modified chromans could be prepared via ortho‐quinone methides (o‐QMs)/hetero‐Diels–Alder (HDA) reactions of the appropriate precursors. The bromide at C6 served as a handle for introducing other substituents through palladium‐catalyzed cross‐coupling reactions and other functional‐group transformations
Powerful Fluoroalkoxy Molybdenum(V) Reagent for Selective Oxidative Arene Coupling Reaction
作者:Moritz Schubert、Jana Leppin、Kathrin Wehming、Dieter Schollmeyer、Katja Heinze、Siegfried R. Waldvogel
DOI:10.1002/anie.201309287
日期:2014.2.24
fluoroalkoxy molybdenum(V) reagent 1 which has superior reactivity and selectivity in comparison to MoCl5 or the MoCl5/TiCl4 reagent mixture in the oxidativecoupling reactions of aryls. Common side reactions, such as chlorination and/or oligomer formation, are drastically diminished creating a powerful and useful reagent for oxidativecoupling. Theoretical treatment of the reagent interaction with 1,2‐
A cyclic diamine compound of formula (1):
1
wherein A is (CH
2
)
n
, (CH
2
)
n
—CH═CH, CO—(CH
2
)
n
or CO—(CH
2
)
n
—CH═CH, in which n is a number of 0 to 3; Z represents a formula (2) or (3):
2
in which R
1
, R
2
, R
4
, R
5
and R
6
are individually a hydrogen atom, alkyl group, alkoxy group, halogen atom or nitro group; R
3
is a hydrogen atom, alkyl group, alkoxy group, halogen atom, nitro group, naphthyl group, or phenyl group which may be substituted by 1 to 3 substituents selected from the group consisting of alkyl groups, alkoxy groups, halogen atoms, a nitro group and a phenyl group; and X and Y are individually CH or a nitrogen atom; and m is 1 or 2;
an acid-addition salt thereof, or a hydrate thereof, and a medicine containing such a compound.