Diastereoselective Synthesis of Protected 1,3-Diols by Catalytic Diol Relocation
摘要:
A complementary diastereoselective gold(I) or bismuth(III) catalyzed tandem hemiacetalization/dehydrative cyclization of 1,5-monoallylic diols was developed to access 1,3-dioxolanes and dioxanes. This methodology provides rapid access to protected 1,3-diols under mild conditions with high levels of diastereoselectivity.
The development of a sequential O–H/C–Hbond functionalization of phenols initiated by the cationic gold(I)-catalyzed cyclization of 1-bromo-1,5-enynes to produce (2-bromocyclopent-2-en-1-yl)phenols is reported. This unprecedented domino transformation efficiently proceeds under mild conditions (5 mol % of (t-Bu)3PAuNTf2, CH2Cl2, 0–23 °C) via an intermediate aryl alkyl ether which collapses at ambient
A gold(I) catalyzed cycloisomerization of indolyl-1,6-enynes via 5-exo-dig cyclization is reported. The reaction passes through an intermediate whose fate can be steered to yield different indolepolycyclic scaffolds through various intra- and inter-molecular cyclization reactions. One of the key transformations of indolyl-1,6-enynes was a formal [2+2+2] cycloaddition reaction with various aldehydes
Highly regioselective synthesis of 2,4,5-(hetero)aryl substituted oxazoles by intermolecular [3+2]-cycloaddition of unsymmetrical internal alkynes
作者:Elli Chatzopoulou、Paul W. Davies
DOI:10.1039/c3cc45410j
日期:——
A robust N-nucleophilic 1,3-N,O-dipole equivalent reacts with unsymmetrical internal alkynes under gold catalysis. Conjugation from a remote nitrogen lone pair enables and controls this convergent and highly regioselective process.
作者:Cyril A. Theulier、Yago García-Rodeja、Nathalie Saffon-Merceron、Karinne Miqueu、Ghenwa Bouhadir、Didier Bourissou
DOI:10.1039/d0cc06978g
日期:——
Regio and stereoselective addition of a phosphine-borane to alkynyl and vinyl gold(i) complexes.
磷硼烷对炔基和乙烯基金属金(i)络合物的区域和立体选择性加成。
Gold-Catalyzed Vinyl Ether Hydroalkynylation: An Alternative Pathway for the Gold-Catalyzed Intermolecular Reaction of Alkenes and Alkynes
作者:Seyedmorteza Hosseyni、Courtney A. Smith、Xiaodong Shi
DOI:10.1021/acs.orglett.6b03228
日期:2016.12.16
this report, the gold-catalyzed intermolecular reaction of vinyl ethers and terminal alkynes is investigated. Utilizing a triazole gold catalyst lessens gold decomposition in the presence of the vinyl ether and affords an alkynylation product instead of the [2 + 2] product. This protocol has been expanded to include glycal substrates, which undergo a one-pot alkynylation–Ferrier reaction to produce functionalized