87118-64-7Relevant articles and documents
Synthesis of (-)-streptenol A, (±)-streptenol B, C and D
Blechert, Siegfried,Dollt, Heribert
, p. 2135 - 2140 (1996)
2-(2,2-Dimethyl-1,3-dioxan-4-yl)acetaldehyde (3) was used for the preparation of streptenol A and B (Scheme 1) via a Grignard reaction with 1-bromopent-3-ene. Hereby optically pure (4′R)-3 gave the antipode of Streptenol A. Reaction with lithiated 1-pentyne opened access to streptenol C and D. To obtain the dienone structure of streptenol C and D, a palladium-catalyzed alkynone isomerization was induced. Kinetic differences in the acid-mediated cleavage of the 1,3-acetonide protected 1,3,5-triol system caused the stereoselectivity in the natural products. So only the (3S*,5R*) acetonide of streptenol B reacted under mild hydrolytic conditions and gave after transacetalization first a 3,5-protected streptenol B with pure relative stereochemistry and finally (3S*, 5R*)-streptenol B. VCH Verlagsgesellschaft mbH, 1996.
Synthesis of Novel HMG-CoA Reductase Inhibitors, I Naphthalene Analogs of Mevinolin
Novak, Lajos,Rohaly, Janos,Poppe, Laszlo,Hornyanszky, Gabor,Kolonits, Pal,et al.
, p. 145 - 158 (2007/10/02)
The title compounds 2 and their corresponding (6S) epimers 18 are prepared in several steps by starting with chiral formyl ester 5, and α-tetralones 10: (1) coupling reaction with the ylide generated from 11 to yield unsaturated ester 13, (2) reduction to the corresponding alcohol 14, (3) addition of the Grignard reagent derived from 14 to formyl ester 5 to afford the hydroxy esters 16 and 17, and (4) lactonization.This procedure is also used to synthesize the β-naphthyl analogs 29 and 30.Some results obtained from HMG-CoA reductase inhibitor screening are also reported. Key Words: HMG-CoA reductase inhibitors / Naphthylacetates / Pig liver esterase / Glutarate, 3-hydroxy / Lactones
CHEMOENZYMATIC SYNTHESIS OF A C5-CHIRAL BUILDING BLOCK: A SUBSTRATE MODIFICATION APPROACH.
Roy, Rene,Rey, Allan, W.
, p. 4935 - 4938 (2007/10/02)
The enantioselectivity of α-chymotrypsin hydrolysis of prochiral dimethyl-3-hydroxyglutarates was contrilled by the proper choice of the hydroxyl protecting groups.This strategy allows the synthesis of a versatile C5-chiral building block.