Dendritic Compound of Triphenylene-2,6,10-Trione Ketal-Tri-{2,2-Di-[(N-Methyl-N-(4-Pyridinyl) Amino) Methyl]-1,3-Propanediol): An Easily Recyclable Catalyst for Morita-Baylis-Hillman Reactions (Report‪)‬

1. INTRODUCTION The Morita-Baylis-Hillman reaction possesses cheap and easy availability of starting materials, easing performance, atom economy, forming chemo-specific functional groups in the product, providing an avenue for introducing asymmetry, and fitting for simulation on the solid phase as a prelude for combinatorial synthesis represent some of the reasons, which have led to an exponential increase in the synthetic utility of this reaction [1,2,3,4,5,6,7,8,9,10]. The Morita-Baylis-Hillman reaction can be promoted by using organic bases. However, almost all the Morita-Baylis-Hillman reactions reported so far use small molecular homogeneous catalyst, and it impedes the reusing of the catalyst. In addition, this reaction could be accomplished in a perfect atom-economic way if a recyclable Lewis base was employed as the promoter Recently, Corma et al. [11] developed a heterogeneous catalyst system by using an insoluble Merrifield type resin-supported 4-(N-benzyl-N-methyl amino)pyridine as reusable catalyst for the Morita-Baylis-Hillman coupling of aromatic aldehydes and unsaturated ketones. Shi [12] reported the use of soluble polymer-supported Lewis bases, such as PEG4600-(PPh2)2 and linear poly (DMAP) in the Morita-Baylis-Hillman reactions of N-tosylimines with unsaturated ketones.