A convenient synthesis of 2′- and 3′-furyl sugars in which the furan and the sugar parts are directly connected is presented. The key step comprises HF·py-induced cyclization of α,β-unsaturated carbonyl compounds (ketones or aldehydes) possessing terminal hydroxymethylene groups protected as TBDPS ethers. Treatment of such furan derivatives with N-phenylmaleimide under high-pressure conditions (11
C12-monosaccharide derivative 2 (obtained from C12-dialdose 1 in 49% overall yield) was used as the starting material for the preparation of C19- and C21-monosaccharide derivatives. Coupling of aldehyde 3 (prepared from the parent alcohol 2) with the sugar derived phosphonates 8, 9, and 10 afforded the C21- (11 and 12 respectively) and C19- (13) monosaccharide derivatives. Aldehyde 3 reacted with phosphorane
REACTION OF SUGAR PHOSPHONATES WITH SUCROSE ALDEHYDES. SYNTHESIS OF HIGHER ANALOGS OF SUCROSE
作者:Mateusz Mach、Sławomir Jarosz
DOI:10.1081/car-100105713
日期:2001.6.30
The Horner-Emmons reaction between sugar phosphonates Sug-C(O)CH2 P(O)(OMe)(2) and aldehydes derived from sucrose afforded precursors of higher analogs of the general formula Sug-C(O)CH==CH-Suc. An example of the functionalization of the internal three-carbon saccharide connecting unit is provided.