Stereoselective 4-Benzyloxybut-2-enylation of Aldehydes via an Allyl-Transfer Reaction Using a Chiral Allyl Donor
摘要:
A direct and highly stereoselective (E)-4-benzyloxybut-2-enylation of aldehydes was successfully carried out to give 5-benzyloxyhomoallylic alcohol (11) via an allyl-transfer reaction using a chiral allyl donor (10). The chiral allyl donor (10) was prepared by catalytic Sharpless asymmetric epoxidation of 3-methylbut-2-en-l-ol, followed by a stereospecific vinyl Grignard reaction of the epoxide in the presence of CuBr and selective benzylation of the primary alcohol of diol.
Concise Asymmetric Synthesis of Orthogonally Protected <i>syn</i>- and <i>anti</i>-1,3-Aminoalcohols
作者:Jae Seung Lee、Dongeun Kim、Lucia Lozano、Suk Bin Kong、Hyunsoo Han
DOI:10.1021/ol303371u
日期:2013.2.1
binfunctional reagents V and ent-V undergo asymmetricaldehydeallylation followed by Ir(I)-catalyzed enantioselective allylic amidation to give orthogonally protected syn- and anti-1,3-aminoalcohols with complete control of absolute and relative stereochemistry. The Mitsunobu reaction of the initial homoallylic alcohol products followed by Ir(I)-catalyzed enantioselective allylic amidation provides