A New Stereospecific Synthesis of 1,2,4-Trideoxy-1,4-Imino-D-Erythro-Pentitol
摘要:
1,2,4-Trideoxy-1,4-imino-D-erythro-pentitol [(2R,3S)-3-hydroxy-2-hydroxymethylpyrrolidine] (4) was synthesised from 2,5-di-O-tosyl-D-ribono-1,4-lactone in 42 % overall yield. The hey steps were deoxygenation at C-2 and a stereospecific inversion of the configuration at C-4. Compound 4 inhibited alpha-D-glucosidase (K-i = 25 mu M) and beta-D-glucosidase (K-i = 80 mu M).
Two approaches to the partial synthesis of C1–C5 of a bis-nor maytansinoid have been investigated starting on the one hand with (S)-(−)-malic acid and on the other, with D-(+)-ribonolactone.
An investigation of the selective di-O-acylation with p-toluenesulfonyl (tosyl) chloride of the four D-pentono-, the eight D-hexono-and D-glycero-D-gulo-heptonolactone has been undertaken, and a number of 2,5-, 2,6- and 2,7-di-O-tosylated lactones have been prepared. Monotosylation of L-erythrono- and L-rhamnonolactone gave the corresponding 2-O-tosylates.
biologically potent and novel 1-deoxythiosugars is accomplished. Introduction of sulfur mediated by benzyltriethylammonium tetrathiomolybdate, as a sulfur transfer reagent through nucleophilic double displacement of tosylate in alpha,omega-di-O-tosyl aldonolactones in an intramolecular fashion is the key feature. The subsequent reduction of thiosugar lactones with borohydride exchange resin (BER) offers a
A New Stereospecific Synthesis of 1,2,4-Trideoxy-1,4-Imino-D-<i>Erythro</i>-Pentitol
作者:Birgitte Mølholm Malle、Inge Lundt、Richard H. Furneaux
DOI:10.1080/07328300008544100
日期:2000.1
1,2,4-Trideoxy-1,4-imino-D-erythro-pentitol [(2R,3S)-3-hydroxy-2-hydroxymethylpyrrolidine] (4) was synthesised from 2,5-di-O-tosyl-D-ribono-1,4-lactone in 42 % overall yield. The hey steps were deoxygenation at C-2 and a stereospecific inversion of the configuration at C-4. Compound 4 inhibited alpha-D-glucosidase (K-i = 25 mu M) and beta-D-glucosidase (K-i = 80 mu M).