Palladium(II)-Catalyzed Dehydrogenative Alkenylation of Cyclic Enaminones via the Fujiwara–Moritani Reaction
摘要:
A new Pd(II)-catalyzed dehydrogenative alkenylation reaction involving two alkenes was developed. A variety of nonaromatic, cyclic enaminones were successfully coupled to primary and secondary alkenes yielding a series of unique 1,3-dienes. The generality of this transformation presents a useful strategy for directly cross-coupling alkenes and offers an attractive new approach to functionallze enaminones.
Biomimetic Aerobic CH Olefination of Cyclic Enaminones at Room Temperature: Development toward the Synthesis of 1,3,5-Trisubstituted Benzenes
作者:Yi-Yun Yu、Gunda I. Georg
DOI:10.1002/adsc.201300904
日期:2014.4.14
A green and mild protocol for the dehydrogenative olefination of cyclicenaminones was devised via palladium catalysis at roomtemperature using oxygen as the terminal oxidant. The synthetic utility of the olefinated cyclicenaminones afforded a series of unique 1,3,5‐trisubstituted benzenes via an unanticipated Diels–Alder tandem reaction. The broad substrate scope and good yields achieved with this
Synthesis of Conjugated Dienes via a Biomimetic Aerobic Oxidative Coupling of Two C<sub>vinyl</sub>H Bonds
作者:Nicolas Gigant、Jan-E. Bäckvall
DOI:10.1002/chem.201301771
日期:2013.8.12
A time to dienes: A highly efficient and general method has been developed to prepare conjugateddienes through a biomimetic approach. This aerobic oxidative coupling, involving two CvinylH bonds, proceeds under low Pd catalyst loading and employs catalytic amounts of p‐benzoquinone and iron phthalocyanine as electron‐transfer mediators (ETMs) under ambient oxygen pressure (see scheme).