Palladium‐Catalyzed Triple Cyclization of 2,7‐Alkadiynylic Carbonates with 2‐Butyne‐1,4‐diol or 2‐Butyne‐1,4‐disulfonamides
作者:Yulong Song、Wangteng Wu、Chunling Fu、Xin Huang、Shengming Ma
DOI:10.1002/adsc.201900162
日期:2019.7.2
A palladium‐catalyzed highly E‐selective triple cyclization of 2,7‐alkadiynylic carbonates with 2‐butyne‐1,4‐diol or 2‐butyne‐1,4‐disulfonamides to construct different tricycles such as 6,8‐dihydrobenzo[1,2‐c:3,4‐c′]difuran‐1(3H)‐one and 1,3,6,7‐tetrahydro‐8H‐furo[3,4‐e]isoindol‐8‐one derivatives has been reported. The alkene group produced and the nucleophilic unit kept in the product provide further
The reaction of a bispropargyl bromide enediyne with several bis-NH-sulfonamide nucleophiles permits the easy synthesis of 14- and 19-membered macrocyclic enediynes. The new nitrogen-containing unsaturated macrocycles are fully characterized. The thermal reactivity of the new cyclic enediyne derivatives is investigated by means of differential scanning calorimetry (DSC).
Rhodium(I)-Catalysed Intramolecular [2+2+2] Cyclotrimerisations of 15-, 20- and 25-Membered Azamacrocycles: Experimental and Theoretical Mechanistic Studies
Number of members makes a difference: The [2+2+2] intramolecularcyclotrimerisation of a new series of 20‐ and 25‐membered azamacrocycles catalysed by the Wilkinson's catalyst are reported (see scheme). The 20‐ and 25‐membered azamacrocycles show different reactivity. Why? Theoretical calculations give insight into the reactivity differences observed for the 20‐ and 25‐membered macrocycles.