A simple stereoselective synthesis of C2-branched 2-deoxy-pentitols.
摘要:
2,3-O-isopropylidene-D(+)-glyceraldehyde reacts with di-l-menthyl-malonate to give the penturonates 2a, and 3a in an erythro-threo 8.5:1 ratio. The C2-branched sugars 2-deoxy-2-hydroxymethyl-3,4-erythro-pentitol 6 and 2-deoxy-2-hydroxymethyl-3,4-threo-pentitol 7 were obtained by submitting 2a and 3a to routine procedures. The same reaction, performed with di-d-menthylmalonate, resulted in a decreased diastereoselectivity, providing a 2.5:1 mixture of erythro and threo diastereomers.
A simple stereoselective synthesis of C2-branched 2-deoxy-pentitols.
摘要:
2,3-O-isopropylidene-D(+)-glyceraldehyde reacts with di-l-menthyl-malonate to give the penturonates 2a, and 3a in an erythro-threo 8.5:1 ratio. The C2-branched sugars 2-deoxy-2-hydroxymethyl-3,4-erythro-pentitol 6 and 2-deoxy-2-hydroxymethyl-3,4-threo-pentitol 7 were obtained by submitting 2a and 3a to routine procedures. The same reaction, performed with di-d-menthylmalonate, resulted in a decreased diastereoselectivity, providing a 2.5:1 mixture of erythro and threo diastereomers.