111136-40-4Relevant articles and documents
Short and efficient chemoenzymatic synthesis of goniothalamin
Gruttadauria, Michelangelo,Lo Meo, Paolo,Noto, Renato
, p. 83 - 85 (2004)
A high-yielding three-step synthesis of goniothalamin involving an enzymatic kinetic resolution in the presence of vinyl acrylate followed by ring-closing metathesis is discussed.
Stereoselective reduction of β,δ-diketo esters. A novel strategy for the synthesis of artificial HMG-CoA reductase inhibitors
Hiyama,Reddy,Minami,Hanamoto
, p. 350 - 363 (2007/10/02)
Condensation of N-methoxy-N-methyl amides with the dianions of acetoacetates gives in good yields β,δ-diketo esters, which are reduced with Et2BOMe-NaBH4 in tetrahydrofuran-methanol highly selectively to give syn-β,δ-dihydroxy esters in one step. Similarly, the β,δ-diketo esters of the Taber's chiral alcohol or its enantiomer respectively are reduced to give syn-β,δ-dihydroxy esters of moderate enantiomeric excess. Higher diastereo- and enantioselectivity were achieved by reduction of the β,δ-diketo esters of the Taber's chiral alcohol or its enantiomer successively with diisobutylalane and with Et2BOMe-NaBH4. The resulting syn-diol esters were hydrolyzed and lactonized to give various types of β-hydroxy-δ-lactones commonly found in artificial HMG-CoA reductase inhibitors.
STUDIES ON THE DIASTEREOSELECTIVE REDUCTION OF β-HYDROXY KETONES TO 1,3-DIOLS WITH COMMON HYDRIDE REAGENTS
Bonini, Carlo,Bianco, Armandodoriano,Fabio,Romano Di,Mecozzi, Sandro,Proposito, Alessandro,Righi, Giuliana
, p. 75 - 80 (2007/10/02)
Some common reducing agents were employed in the diastereoselective reduction of several β-hydroxy ketones to their corresponding syn-1,3-diols.The use of NaBH4 with a Ti(IV) chelating species produced syn diols with a moderate to good selectivity significantly depending upon the reaction conditions chosen (solvent, temperature, nature of the titanium species).The use of LiAlH4 at low temperature, in the presence of LiI, showed a high selectivity for reduction to syn diols, thus demonstrating a possible chelating role of lithium.Some interesting preliminary results have been also obtained in the diastereoselective reduction of MEM-protected β-alkoxy ketones.