Tandem double hydrophosphination of α,β,γ,δ-unsaturated-1,3-indandiones: diphosphine synthesis, mechanistic investigations and coordination chemistry
作者:László B. Balázs、Jasmina B. Khalikuzzaman、Yongxin Li、Dániel Csókás、Sumod A. Pullarkat、Pak-Hing Leung
DOI:10.1039/c9cc05384k
日期:——
Mechanistic investigations confirmed the consecutive manner of the nucleophilicaddition reaction. Complexation of the generated keto-diphosphine resulted in the formation of an unexpected tridentate bridging ligand with an anionic P,O-bidentate and a neutral P-monodentate coordination mode on two palladium units. In the presence of an external chiral auxiliary, the coordinated diphosphines could be separated
The catalyst-controlled diversity-oriented synthesis of spirohydroquinoline-indandiones and 3-methylenehydroquinoline-indandiones from ortho-sulfonamidophenyl-substituted para-quinone methides and allylidene-indandiones is reported. The strategies utilized an organobase such as DMAP or TMG to control the reaction pathway chemoselectively, furnishing the corresponding products in 40–99% yields with