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
Catalytic enantioselective reactions. Part 16. Oxazaborolidine-catalyzed asymmetric borane reduction of α-keto acetals
作者:Byung Tae Cho、Yu Sung Chun
DOI:10.1039/a903335a
日期:——
Asymmetricreductions of α-keto acetals using various oxazaborolidines and borane reagents as catalyst and the hydride source, respectively, were compared. The reduction catalyzed by Corey’s CBS reagents with N-phenylamine–borane reagents provided α-hydroxy acetals with very high enantioselectivities for most aromatic analogues.
TIECCO, M.;TESTAFERRI, L.;TINGOLI, M.;BARTOLI, D., J. ORG. CHEM., 55,(1990) N5, C. 4523-4528
作者:TIECCO, M.、TESTAFERRI, L.、TINGOLI, M.、BARTOLI, D.
DOI:——
日期:——
An interrupted Heyns rearrangement approach for the regioselective synthesis of acylindoles
作者:Minakshi Altia、Pazhamalai Anbarasan
DOI:10.1039/d3cc04144a
日期:——
An efficient and general method for the synthesis of 2- and 3-acylindoles has been achieved with high regioselectivity from o-acylanilines and α-hydroxycarbonyl or its equivalent. The strategy involves the intramolecular trapping of an in situ generated aminoenol intermediate and an interrupted Heyns rearrangement pathway, followed by aromatization or rearrangement/aromatization. Important features