Cp*Ru(cod)Cl-Catalyzed [2 + 2 + 2] Cycloaddition of 1,6-Heptadiynes with Allylic Ethers. A Decisive Role of Coordination to the Ether Oxygen Atom

Ruthenium‐Catalyzed Reactions—A Treasure Trove of Atom‐Economic Transformations

“…If an olefin [223] or a diene [224] is substituted for the third alkyne moiety, cyclic dienes and trienes can be formed [Eq. (71)].…”

Palladium catalysed tandem cyclisation–anion capture processes. Part 8 : In situ and preformed organostannanes. Carbamyl chlorides and other starter species

“…A possible catalytic cycle for the synthesis of 17 is illustrated in Scheme 6 [23]. 1,6-Diynes 19-22 were prepared in high yield using a standard alkylation procedure [25]. We selected 23-26 as cyclisation precursors (''zippers'') [18] generating 5-membered and 6-membered products.…”

“…[118][119]75.45;H,5.70;N,4.05. C 21 H 19 NOS requires: C,75.65;H,5.70;N,4.20%); m max /cm À1 1709, 1612, 1489, 1467, 1455 and 1359; d H (250 MHz), 7.29 (dd, J = 6.9, 1.2Hz, 1H, ArH), 7.18-7.14 (m, 5H, ArH), 7.10 (td, J = 7.0, 1.5 Hz, 1H, ArH), 6.96 (dd, J = 5.1, 1.1 Hz, 1H, thienyl H), 6.79-6.76 (m, 1H, ArH), 6.73-6.70 (m, 1H, ArH), 6.63 (d, J = 3.3 Hz, 1H, thienyl H), 6.49 (dd, J = 6.9, 1.4 Hz, 1H, ArH), 5.06 and 4.50 (AB, 2· d, J = 15.9 Hz, 2· 1H, NCH 2 Ph), 3.53 and 3.30 (AB, 2· d, J = 14.2 Hz, 2· 1H, CH 2 ) and 1.55 (s, 3H, CH 3 ); m/z (%) 334(M + H + , 100), 252 (25) and 236(77).…”

Ruthenium‐katalysierte Reaktionen – eine Schatzkiste für atomökonomische Umwandlungen

“…Ersetzt man die dritte Alkin-Einheit durch ein Olefin [223] oder ein Dien, [224] werden cyclische Diene bzw. Triene gebildet [Gl.…”