Regiodivergent Hydration–Cyclization of Diynones under Gold Catalysis
作者:Marta Solas、Miguel A. Muñoz、Samuel Suárez-Pantiga、Roberto Sanz
DOI:10.1021/acs.orglett.0c02892
日期:2020.10.2
Skipped diynones, efficiently prepared from biomass-derived ethyl lactate, undergo a tandem hydration–oxacyclization reaction under gold(I) catalysis. Reaction conditions have been developed for a switchable process that allows selective access to 4-pyrones or 3(2H)-furanonesfrom the same starting diynones. Further application of this methodology in the total synthesis of polyporapyranone B was demonstrated
A One-Pot Synthesis and Functionalization of Polyynes
作者:Yasuhiro Morisaki、Thanh Luu、Rik R. Tykwinski
DOI:10.1021/ol0528888
日期:2006.2.1
[reaction: see text] A one-pot synthesis and derivatization of diynes and triynes is reported. The polyyne framework is formed from a dibromoolefin precursor based on a carbenoid rearrangement, and the resulting Li-acetylide is then trapped in situ with an electrophile to provide functionalized di- and triynes. Alternatively, transmetalation of the Li-acetylide intermediate provides either the Zn-
One-Pot Formation and Derivatization of Di- and Triynes Based on the Fritsch−Buttenberg−Wiechell Rearrangement
作者:Thanh Luu、Yasuhiro Morisaki、Nina Cunningham、Rik R. Tykwinski
DOI:10.1021/jo701810g
日期:2007.12.1
A divergent, one-pot synthesis of functionalized polyynes has been developed. Beginning with the appropriately substituted dibromoolefinic precursor, a carbenoid Fritsch−Buttenberg−Wiechell (FBW) rearrangement is used to generate the lithium acetylide of a conjugated polyyne framework, and subsequent trapping with carbon-based electrophiles provides for in situ formation of a wide range of di- and
Synthesis of 2-Alkynyl-1,4-cyclohexadienes via a Diels–Alder Reaction of Conjugated 2,4-Diynones
作者:Wesley Chalifoux、Khagendra Hamal、Radha Bam
DOI:10.1055/s-0035-1561451
日期:——
reactive dienophiles in the Diels–Alder cyclization reaction is of value in producing diversely functionalized, and therefore useful, cyclic products. We have developed a Diels–Alderreaction of conjugated 2,4-diynones, promoted by Lewis acids, to produce substituted 2-alkynyl-1,4-cyclohexadiene (‘skipped’ cyclohexadiene) products in good to excellent yields. The reaction was successful with a variety
Reactions of [H<sub>2</sub>Os<sub>3</sub>(CO)<sub>10</sub>] with Conjugated Diynes (RC<sub>2</sub>C<sub>2</sub>R‘) Containing Nucleophilic Oxygen in β Position of a Substituent (R = Ph, R‘ = CH<sub>2</sub>OH, C(O)Ph; R = R‘ = CMe<sub>2</sub>(OH))
作者:Sergey P. Tunik、Vassily D. Khripoun、Irina A. Balova、Maxim E. Borovitov、Ivan N. Domnin、Ebbe Nordlander、Matti Haukka、Tapani A. Pakkanen、David H. Farrar
DOI:10.1021/om0304107
日期:2003.8.1
Reactions of [H2Os3(CO)10] with a series of diynes, RC2C2R‘ (1: R = Ph, R‘ = CH2OH; 2: R = Ph, R‘ = C(O)Ph; 3: R = R‘ = C(OH)Me2), have been studied. It was found that upon coordination to the triosmium cluster, the nucleophilic oxygens of the R‘ substituents of 1 and 2 take part in intramolecular cyclization reactions to give [HOs3(CO)10μ-η1:η2-PhCH2(CCH−CCH−O)}] (5) and [HOs3(CO)10μ-η1:η1-Ph(CCH−CC−O)CPh}]