@article{SchmidtRiemerSchilde2015, author = {Schmidt, Bernd and Riemer, Martin and Schilde, Uwe}, title = {Tandem Claisen Rearrangement/6-endo Cyclization Approach to Allylated and Prenylated Chromones}, series = {European journal of organic chemistry}, journal = {European journal of organic chemistry}, number = {34}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {1434-193X}, doi = {10.1002/ejoc.201501151}, pages = {7602 -- 7611}, year = {2015}, abstract = {Allyl, dimethylallyl and prenyl ethers derived from o-acyl-phenols reacted upon microwave irradiation to form C-allylated or -prenylated chromone derivatives, depending on the substitution pattern of the arene and the allyl substituent. The reaction proceeds through a tandem Claisen rearrangement and 6-endo-trig or 6-endo-dig cyclization sequence. For prenyl ethers, the tandem sequence can be extended by a Cope rearrangement to furnish 6-prenylchromones. The method is potentially useful for the synthesis of natural products and drugs.}, language = {en} } @article{SchmidtRiemerSchilde2014, author = {Schmidt, Bernd and Riemer, Martin and Schilde, Uwe}, title = {Chroman-4-ones via microwave-promoted domino claisen rearrangement-oxa-michael addition: Synthesis of tabchromones A and B}, series = {Synlett : accounts and rapid communications in synthetic organic chemistry}, volume = {25}, journal = {Synlett : accounts and rapid communications in synthetic organic chemistry}, number = {20}, publisher = {Thieme}, address = {Stuttgart}, issn = {0936-5214}, doi = {10.1055/s-0034-1379364}, pages = {2943 -- 2946}, year = {2014}, abstract = {Allyl phenyl ethers with a pendant enone substituent undergo, upon microwave irradiation, a domino sequence of Claisen rearrangement and 6-endo-trig-cyclization to furnish functionalized chroman-4-ones. The natural products tabchromones A and B were synthesized via this method.}, language = {en} }