Y(OTf)3 catalyzed substitution dependent oxidative C(sp3)–C(sp3) cleavage and regioselective dehydration of β-allyl-β-hydroxydithioesters: alternate route to α,β-unsaturated ketones and functionalized dienes
摘要:
beta-Allyl-beta-hydroxydithioesters have been generated by the regioselective Grignard addition to the beta-oxodithioesters. They have been successfully employed in selective C(sp(3))-C(sp(3)) bond cleavage to construct alpha,beta-unsaturated ketone residues by the treatment of an emerging catalyst yttrium(III)triflate for the first time. On the other hand, hetaryl substituted beta-allyl-beta-hydroxydithioesters led to the useful diene precursors through selective dehydration under the similar conditions. (c) 2013 Elsevier Ltd. All rights reserved.
Y(OTf)3 catalyzed substitution dependent oxidative C(sp3)–C(sp3) cleavage and regioselective dehydration of β-allyl-β-hydroxydithioesters: alternate route to α,β-unsaturated ketones and functionalized dienes
摘要:
beta-Allyl-beta-hydroxydithioesters have been generated by the regioselective Grignard addition to the beta-oxodithioesters. They have been successfully employed in selective C(sp(3))-C(sp(3)) bond cleavage to construct alpha,beta-unsaturated ketone residues by the treatment of an emerging catalyst yttrium(III)triflate for the first time. On the other hand, hetaryl substituted beta-allyl-beta-hydroxydithioesters led to the useful diene precursors through selective dehydration under the similar conditions. (c) 2013 Elsevier Ltd. All rights reserved.
Y(OTf)3 catalyzed substitution dependent oxidative C(sp3)–C(sp3) cleavage and regioselective dehydration of β-allyl-β-hydroxydithioesters: alternate route to α,β-unsaturated ketones and functionalized dienes
beta-Allyl-beta-hydroxydithioesters have been generated by the regioselective Grignard addition to the beta-oxodithioesters. They have been successfully employed in selective C(sp(3))-C(sp(3)) bond cleavage to construct alpha,beta-unsaturated ketone residues by the treatment of an emerging catalyst yttrium(III)triflate for the first time. On the other hand, hetaryl substituted beta-allyl-beta-hydroxydithioesters led to the useful diene precursors through selective dehydration under the similar conditions. (c) 2013 Elsevier Ltd. All rights reserved.
Regioselective dehydrative intramolecular heteroannulation of β-allyl-β-hydroxy dithioesters: facile and straightforward entry to 2H-thiopyrans
beta-Allyl-beta-hydroxy dithioesters have been employed in the synthesis of hitherto unreported and synthetically demanding 2H-thiopyrans via regioselective intramolecular annulation strategy. Lewis acid BF3 center dot Et2O efficiently mediates the regioselective dehydration followed by intramolecular thioannulation at room temperature. The attractive features of this protocol include mild conditions, high atom-economy and excellent yields with the elimination of water as the only by-product. (C) 2013 Elsevier Ltd. All rights reserved.