provided evidence that this one‐pot synthesis proceeds through at least twelve consecutive transformations and includes at least nine different chemical reactions, making it the longest cascade reaction sequence known to date. We describe the scope and limitations of the cascadesynthesisapproaches and the development of an enantioselectively catalyzed centrocountin synthesis.
In biology-orientedsynthesis, the scaffolds of biologically relevant compound classes inspire the synthesis of focused compoundcollections enriched in bioactivity. This criterion is, in particular, met by the scaffolds of natural products selected in evolution. The synthesis of natural product–inspired compoundcollections calls for efficient reaction sequences that preferably combine multiple individual
4-Picoline-catalyzed hetero-Diels–Alder type reactions: one-pot synthesis of pyrano[4,3-c]chromenes
作者:Michael A. Terzidis、Eleni Dimitriadou、Constantinos A. Tsoleridis、Julia Stephanidou-Stephanatou
DOI:10.1016/j.tetlet.2009.02.077
日期:2009.5
An organocatalytic hetero-Diels–Alder type reaction between α,β-unsaturated aldehydes and acetylenedicarboxylates is achieved which offers an efficient one-pot access to a new class of pyrano[4,3-c]chromenes from simple and readily available starting materials under mild reaction conditions.
在α,β-不饱和醛与炔二羧酸之间实现了有机催化的杂狄尔斯-阿尔德型反应,可在简单易用的起始原料下,高效地从一锅中获得新型吡喃并[4,3- c ]苯二酚。反应条件温和。
Efficient and Atom-Economic Synthesis of α-Substituted β-Chromonyl-α,β-unsaturated Carbonyls through Molecular Rearrangement
Under mild acidic conditions [4+2] cycloadducts of 3-formylchromones and acetylenecarboxylates rearrange to yield α-substituted-β-chromonyl-α,β-unsaturated carbonyl compounds in excellent yields.