An efficient approach to the stereoselective synthesis of 2,6-disubstituted dihydropyrans via stannyl-Prins cyclization
作者:Magdalena Dziedzic、Bartłomiej Furman
DOI:10.1016/j.tetlet.2007.11.128
日期:2008.1
A general method has been developed for the stereoselective construction of 2,6-disubstituted dihydropyrans based on the Lewisacid-catalyzed intramolecular reactions of oxocarbenium ions with vinylstannanes. This novel methodology was applied to the enantioselective total synthesis of (−)-centrolobine.
Enantioselective Synthesis of (<i>E</i>)-δ-Stannyl Homoallylic Alcohols via Aldehyde Allylboration Using α-Stannylallylboranes Generated by Allene Hydroboration Followed by a Highly Diastereoselective 1,3-Boratropic Shift
作者:Ming Chen、Daniel H. Ess、William R. Roush
DOI:10.1021/ja103041u
日期:2010.6.16
A highly enantioselectivesynthesis of (E)-delta-stannyl homoallylicalcohols 4 via aldehyde allylboration reactions of the double-chiral allylborane reagent 2a is reported. Allylborane 2a was generated from the hydroboration of commercially available allenylstannane 1 with ((d)Ipc)(2)BH at -40 to -20 degrees C followed by a kinetically controlled and highly diastereoselective 1,3-boratropic shift