Unusual Tandem Oxidative C–C Bond Cleavage and Acetalization of Chalcone Epoxides in the Presence of Iodine in Methanol
作者:Shriniwas Samant、Balaso Jadhav
DOI:10.1055/s-0033-1339134
日期:——
of chalcone epoxides is observed where chalcone epoxides on heating with iodine in methanol leads to α,α-dimethoxyacetophenones, through C–C bondcleavage followed by acetalization of the formyl group. The process occurs through ring opening of the chalcone epoxide by methanol to form β-methoxy alcohol, cleavage of the C–C bond in the latter to form α-ketoaldehyde, and acetalization of the formyl group
Copper(II)triflate Promoted Highly Chemoselective Rearrangement of Chalcone Epoxides to β-keto Aldehydes
作者:Balaso Jadhav、Ashish A. Vaidya、Shriniwas D. Samant
DOI:10.2174/1570178611666141024005454
日期:2015.1.1
Highly chemoselective rearrangement of chalcone epoxides to β-keto aldehydes using catalytic amount of Cu(OTf)2 (1 mol%) is presented. Copper(II)triflate is a relatively cheap, inexpensive and commercially available catalyst. In this rearrangement selective migration of the acyl group takes place. The presence of an electron donating group on either of the phenyl rings favors the reaction. However