Total Synthesis of Both Methyl 4a-Carba-<scp>d</scp>-arabinofuranosides
作者:Christopher S. Callam、Todd L. Lowary
DOI:10.1021/ol9912682
日期:2000.1.1
[reaction: see text] The totalsynthesis of methyl 4a-carba-alpha-D-arabinofuranoside (1) and methyl 4a-carba-beta-D-arabinofuranoside (2) has been achieved starting from D-mannose (5). Key transformations included a ring-closing metathesis of diene 11 employing Schrock's catalyst followed by a stereoselective hydrogenation with Wilkinson's catalyst.
Synthesis and Conformational Investigation of Methyl 4a-Carba-<scp>d</scp>-arabinofuranosides
作者:Christopher S. Callam、Todd L. Lowary
DOI:10.1021/jo010827r
日期:2001.12.1
synthesis of both targets. Through the use of NMR spectroscopy, we have probed the ring conformation of 3 and 4, as well as the rotamer populations about the C(4)-C(5) and C(1)-O(1) bonds. These studies have demonstrated that there are differences in ring conformation between these carbasugars and their glycoside parents (1 and 2). However, only minor differences are seen in the rotameric equilibrium about