A New Simple Procedure for the Isomerization of 2-Furylcarbinols to Cyclopentenones
摘要:
The previously reported acid catalyzed isomerization of 2-furylcarbinols to 5-alkyl-4-hydroxycyclopent-2-enones was performed in boiling water in the absence of any acid catalyst. In this case the reaction led to the formation of more stable isomer 2-alkyl- or 2-aryl-4-hydroxycyclopent-2-enones. The reaction of chiral 2-furylcarbinol in the presence of zinc chloride gave a racemic cyclopentenone while 2-furylcarbinol did not undergo racemization. A new mechanism for the conversion of 2-furylcarbinols into cyclopentenone is proposed.
Highly Enantioselective Addition of In Situ Prepared Arylzinc to Aldehydes Catalyzed by a Series of Atropisomeric Binaphthyl-Derived Amino Alcohols
作者:Gui Lu、Fuk Yee Kwong、Ji-Wu Ruan、Yue-Ming Li、Albert S. C. Chan
DOI:10.1002/chem.200501048
日期:2006.5.15
catalyst, both enantiomers of many pharmaceutically interesting diarylmethanols can be obtained by the proper combination of various arylzinc reagents with different aldehydes; this catalytic system also works well for the phenylation of aliphatic aldehydes to give up to 96 % ee.
A novel ruthenium catalyst on the basis of a chiral monophosphorus ligand is efficient for the asymmetricaddition of arylboronicacids to aryl aldehydes, providing a series of chiral diarylmethanols in excellent yields and enantioselectivities (up to 92% ee). Preliminary study has shown that this process is catalyzed by a Ru complex with a single monophosphorus ligand.
Isosterically designed chiral catalysts: Rationale, optimization and their application in enantioselective nucleophilic addition to aldehydes
作者:En Gao、Qiao Li、Lili Duan、Lin Li、Yue-Ming Li
DOI:10.1016/j.tet.2020.131648
日期:2020.11
enantioselective nucleophilic addition to aldehydes. In the presence of 10 mol% of chiral ligand 1b, enantioselective addition of diethylzinc to aldehydes provided the corresponding secondary alcohols in up to 90% isolated yield and up to 99% ee. Similarly, using 3e as chiral ligand, enantioselective arylation and alkynylation of aldehydes also proceeded readily, leading to the desired chiral alcohols in up to
Application of β-Hydroxysulfoximines in Catalytic Asymmetric Phenyl Transfer Reactions for the Synthesis of Diarylmethanols
作者:Jörg Sedelmeier、Carsten Bolm
DOI:10.1021/jo7016718
日期:2007.11.1
Enantiomerically enriched diarylmethanols have been prepared by catalyzed asymmetric phenyl transfer reactions onto aromatic aldehydes with use of readily available β-hydroxysulfoximines as catalysts. As the aryl source, combinations of diethylzinc with either diphenylzinc or triphenylborane have been applied affording arylphenylmethanols with up to 93% ee in good yields. Various functionalized aldehydes
作者:Daniel Thiel、Fabian Blume、Christina Jäger、Jan Deska
DOI:10.1002/ejoc.201800333
日期:2018.6.7
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