fun: The synthetic potential of the highly regio‐ and stereoselective title reaction, which relies on two oxidativecleavage steps promoted by RuCl3 in combination with NaIO4 (see example; Bz=benzoyl), was demonstrated with the synthesis of biologically active cis‐(2R,3S)‐3‐hydroxypipecolic acid from D‐glucose.
the chemoselective cleavage of benzylideneacetals having sensitive functional groups under mild conditions. It is easy to perform on large scale owing to minimal catalyst loading (0.5 mol-%). Several sensitive functional groups such as TBDPS ether, -OMs, -OAc, allyl ether, N-Boc, N-Fmoc and N-Cbz are stable under the reaction conditions. In addition, benzylideneacetal is selectively cleaved in the
A regioselective reductive cleavage of benzylidene acetal: stereoselective synthesis of N-Boc-protected cis-(2R,3S)-3-hydroxy pipecolic acid
作者:Ponminor Senthil Kumar、Sundarababu Baskaran
DOI:10.1016/j.tetlet.2009.03.007
日期:2009.7
A stereoselective synthesis of N-Boc-protected cis-(2R,3S)-3-hydroxy pipecolic acid, starting from d-glucose is described. The key step in the overall synthesis is a highly regioselectivereductivecleavage of benzylidene acetal 13 leading to hydroxymethyl piperidine derivative 14.