Diastereoselective Synthesis of Piperidine Imino Sugars Using Aldol Additions of Metalated Bislactim Ethers to Threose and Erythrose Acetonides
作者:María Ruiz、Tania M. Ruanova、Olga Blanco、Fátima Núñez、Cristina Pato、Vicente Ojea
DOI:10.1021/jo702601z
日期:2008.3.1
anti-selectivity for the mismatched ones may originate from (1) the intervention of solvated aggregates of tin(II) azaenolate and lithium chloride as the reactive species and (2) favored chair-like transition structures with a Cornforth-like conformation for the aldehyde moiety. DFT calculations indicate that aldol additions to erythrose acetonides proceed by an initial deprotonation, followed by coordination
Diastereoselective Synthesis of 1-Deoxytalonojirimycin
作者:María Ruiz、Vicente Ojea、José María Quintela
DOI:10.1055/s-1999-3155
日期:1999.2
1-Deoxy-d-talonojirimycin ((-)-3) has been synthesised in four steps (38% yield), via a syn-aldol reaction between 2,3-O-isopropylidene-d-erythrose (5) and the stannous salt of the Schöllkopf's bislactim ether 6 followed by the chemoselective oxidation and intramolecular reductive amination of 1,4-diol and lactol key intermediates, 8 and 9, respectively.