Active methylene compounds undergo chemical condensation in water with aldehydes derived from yeast oxidation of the corresponding alcohols. Unsaturated compounds so obtained are then further reduced by yeast.
Reaction of CH-acids with Michael acceptors in the presence of potassium carbonate. Syntheses of 6-acetyl- and 3,5-dialkylcyclohex-2-enones
作者:D. S. Khachatryan、A. A. Vardapetyan、N. M. Morlyan、A. L. Razinov、K. R. Matevosyan
DOI:10.1007/s11172-015-0873-y
日期:2015.2
The reaction of acetylacetone with α,β-enones in the presence of potassium carbonate affords 6-acetylcyclohex-2-enones. The assembly of two acetoacetate and one alkanal molecules gives 3,5-dialkylcyclohex-2-enones. Facile one-pot procedures for these reactions were developed.
A large group of derivatives of 3-furoic acid and 3-furyl ketones can be prepared in high yield by a process which consists of reacting an .alpha.,.beta.-unsaturated ketone having either an .alpha.-carboalkoxy or .alpha.-acyl group with N-bromosuccinimide and thermally cyclizing the resulting bromine containing intermediate.
Highly Diastereo- and Enantioselective Formal [4 + 2] Cyclization of Nitroalkenes and Unsaturated Ketoesters under Phase-Transfer Catalysis
作者:Yiming Guo、Linping Wu、Fayang G. Qiu
DOI:10.1021/acs.orglett.2c03418
日期:2022.11.18
A highlydiastereo- and enantioselective formal [4 + 2] cyclization of α,β-unsaturated ketoesters with nitroalkenes through a tandem asymmetric Michael addition–intramolecular Henry reaction under dihydroquinine-based phase-transfer catalysis, leading to a one-pot construction of four contiguous stereochemical centers and multiple functional groups with excellent diastereo- and enantioselectivities