TY  - JOUR
A1  - Schmidt, Bernd
A1  - Schultze, Christiane
T1  - A one-pot synthesis of pyranocoumarins through microwave-promoted propargyl claisen rearrangement/wittig olefination
JF  - European journal of organic chemistry
N2  - The reaction between propargyl ethers of hydroxybenzaldehydes and the ylide ethyl (triphenylphosphoranylidene)acetate was carried out under microwave irradiation to regioselectively afford angular pyranocoumarins. The chromene and coumarin heterocyclic scaffolds were simultaneously formed in the same synthetic step without changing the reaction conditions. The natural products seselin, braylin, and dipetalolactone were among the products synthesized by this method.
KW  - Domino reactions
KW  - Alkynes
KW  - Arenes
KW  - Oxygen heterocycles
KW  - Microwave chemistry
KW  - Rearrangement
Y1  - 2017
SN  - 1434-193X
SN  - 1099-0690
VL  - 2018
IS  - 2
SP  - 223
EP  - 227
PB  - Wiley-VCH Verl.
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Wessig, Pablo
A1  - Pick, Charlotte
A1  - Schilde, Uwe
T1  - First example of an atropselective dehydro-Diels-Alder (ADDA) reaction
JF  - Tetrahedron letters
N2  - A new concept of a stereoselective synthesis of axially chiral biaryls, formed in the course of the dehydro-Diels-Alder (DDA) reaction, has been disclosed. It is based on asymmetric induction of the newly formed chirality axis by a chirality center, which is present in the two synthesized DDA reactants. Depending on the different length of the linkers joining the alkyne moieties the DDA reaction may be triggered photochemically or thermally, where only the thermal variant was stereoselective.
KW  - Cycloaddition
KW  - Atropselecrivity
KW  - Biaryls
KW  - Alkynes
KW  - Photochemistry
Y1  - 2011
U6  - https://doi.org/10.1016/j.tetlet.2011.06.024
SN  - 0040-4039
VL  - 52
IS  - 32
SP  - 4221
EP  - 4223
PB  - Elsevier
CY  - Oxford
ER  -