William Roxburgh, Botanic Garden, near Calcutta, [India], to James Edward Smith

In addition to other items he is sending by Mr Brown also sending seeds, and box of insects gathered by Mr Le Beck, they both wish to become members of the Linnean Society; Le Beck will be a valuable correspondent as he intends to spend his life in India. Recently drew and described a new species of 'Dolphinus'; as large as common dolphin but without dorsal fin, 60 teeth in each jaw, and chiefly inhabits the Ganges river, calls it 'D. gangetica'. [Francis] Buchanan is visiting them; he will send Smith plants

Relay Rh(II)/Pd(0) Dual Catalysis: Selective Construction of Cyclic All-Quaternary Carbon Centers

A novel relay Rh­(II)/Pd(0) dual catalysis strategy that promotes the divergent reaction of α-diazo-carbonyl compounds with allylic carboxylates for the selective construction of cyclic all-quaternary carbon centers has been developed. This binary catalyst system rendered domino C–H insertion/allylic alkylation process under mild conditions. Remarkably, the domino catalytic reaction shows good selectivity and excellent tolerance to various functionalities and is operationally simple

Relay Rh(II)/Pd(0) Dual Catalysis: Selective Construction of Cyclic All-Quaternary Carbon Centers

A novel relay Rh­(II)/Pd(0) dual catalysis strategy that promotes the divergent reaction of α-diazo-carbonyl compounds with allylic carboxylates for the selective construction of cyclic all-quaternary carbon centers has been developed. This binary catalyst system rendered domino C–H insertion/allylic alkylation process under mild conditions. Remarkably, the domino catalytic reaction shows good selectivity and excellent tolerance to various functionalities and is operationally simple

Gold(III)-Catalyzed Regioselective Oxidation/Cycloisomerization of Diynes: An Approach to Fused Furan Derivatives

The first gold­(III)-catalyzed regioselective oxidation/cycloisomerization of diynes <b>1</b> with pyridine <i>N</i>-oxide as the oxidant was developed, providing a range of synthetically valuable and useful fused furan derivatives <b>3</b> in moderate to good yields. Control experiments and the confirmation structure of minor products <b>5</b> suggest that this chemistry was a concerted gold­(III)-catalyzed oxidation/S_N2′-type addition/cyclization process via a β-gold vinyloxypyridinium intermediate and a putative vinyl cation intermediate

Rh(II)/Pd(0) Dual Catalysis: Regiodivergent Transformations of Alkylic Oxonium Ylides

A Rh­(II)/Pd(0) dual-catalysis strategy that promotes the regio-divergent transformations of alkylic oxonium ylides from α-diazo-β-ketoesters has been developed. Polyfunctionalized dihydrofuran-3-ones with an <i>O</i>-substituted quaternary carbon center and 2,3-disubstituted benzofurans can be selectively obtained in good to excellent yields at room temperature via one-pot synthesis. The reaction mechanism was further investigated by the control, stepwise, and crossover experiments

Metal-Free, Site-Selective Addition to Ynones: An Approach to Synthesize Substituted Quinoline Derivatives

An efficient two component cycloaddition reaction to synthesize various substituted quinoline derivatives was developed. Ynone <b>1</b> was functionalizated by <i>N</i>-oxide attacking the C3-oxetium site and C3-site regioselectively to give <b>3</b> and <b>4</b>. Analogues <b>3k</b> and <b>4v</b> have a high binding constant with Hg²⁺ in CH₃CN

Metal-Free, Site-Selective Addition to Ynones: An Approach to Synthesize Substituted Quinoline Derivatives

An efficient two component cycloaddition reaction to synthesize various substituted quinoline derivatives was developed. Ynone <b>1</b> was functionalizated by <i>N</i>-oxide attacking the C3-oxetium site and C3-site regioselectively to give <b>3</b> and <b>4</b>. Analogues <b>3k</b> and <b>4v</b> have a high binding constant with Hg²⁺ in CH₃CN

Metal-Free, Site-Selective Addition to Ynones: An Approach to Synthesize Substituted Quinoline Derivatives

An efficient two component cycloaddition reaction to synthesize various substituted quinoline derivatives was developed. Ynone <b>1</b> was functionalizated by <i>N</i>-oxide attacking the C3-oxetium site and C3-site regioselectively to give <b>3</b> and <b>4</b>. Analogues <b>3k</b> and <b>4v</b> have a high binding constant with Hg²⁺ in CH₃CN

Gold-Catalyzed Oxidation Terminal Alkyne: An Approach to Synthesize Substituted Dihydronaphthalen-2(1<i>H</i>)‑ones and Phenanthrenols

A facile gold-catalyzed oxidation terminal alkynes to synthesize substituted dihydronaphthalen-2­(1<i>H</i>)-ones <b>3</b> and phenanthrenols <b>5</b> was realized. Various useful structures and drug precursors were generated in up to 99% yield under mild condition and low catalyst loading