Terminal allylicalcohols are important motifs in natural products, and also key intermediates/precursors in numerous novel reaction transformations. In this study, enabled by a bifunctional ligand featuring a basic amino group, a gold-catalyzed hydroarylation of terminal unactivated propargylic alcohols with heteroareneboronic acids has been first established, and efficiently affords various terminal
A manganese(I)/Lewisacid cocatalyzed direct C−H propargylation with high selectivity has been developed. BPh3 was discovered to not only promote the reactivity, but also enhance the selectivity. Secondary, tertiary, and even quaternary carbon centers at the propargylic position could be directly constructed. Both internal and terminal alkynes are easily accessible. The chirality was successfully transferred
The use of Br/Cl to promote regioselective gold-catalyzed rearrangement of propargylic carboxylates: an efficient synthesis of (1Z, 3E)-1-bromo/chloro-2-carboxy-1,3-dienes
作者:Yanzhao Wang、Biao Lu、Liming Zhang
DOI:10.1039/c0cc03669b
日期:——
A gold-catalyzed synthesis of 1-bromo/chloro-2-carboxy-1,3-dienes is developed using propargylic carboxylates containing halogenated alkynes as substrates. The reaction is highly diastereoselective, and the halogen atom at the alkyne terminus selectively promotes a 1,2-acyloxy migration. The diene products participate in the Diels–Alder and cross-coupling reactions.
Allenes. Part XIII. Syntheses of hexa-3,4-dien-1-ol and penta-2,3-dien-1-ol
作者:Phyllis D. Landor、S. R. Landor、E. S. Pepper
DOI:10.1039/j39670000185
日期:——
Two simple allenic alcohols, hexa-3,4-dien-1-ol and penta-2,3-dien-1-ol have been synthesised by the reduction of propynyl halides. These methods failed to give allenic alcohols when applied to conjugated diynyl halides. The mechanistic implications are discussed.