Boronate esters that contain N-donor groups are self-complementary structures, which can assemble by means of dative boron–nitrogen bonds to form macrocycles or polymers. Herein, we describe the synthesis of dioxaborinanes and benzodioxaboroles containing pyridylsidechains. In the solid state, the dioxaborinanes were found to exist predominantly as monomers. Upon crystallization, aggregation into
Enzyme catalysed asymmetrization of pyridyl substituted 1,3-propanediols and of the corresponding diacetates
作者:Giuseppe Guanti、Enrica Narisano、Renata Riva
DOI:10.1016/s0957-4166(97)00218-8
日期:1997.7
2-(4-pyridyl)- and 2-(2-pyridyl)-1,3-propanediols 1 and 4 were prepared and asymmetrized by enantioselective acetylation in organic solvent catalysed by hydrolytic enzymes, the best being supported pig pancreatic lipase, to give new valuable heterocyclic chiral building blocks. The asymmetrization of diacetate 6, catalysed by pig pancreatic lipase is also described. (C) 1997 Elsevier Science Ltd.