Stereoselective Synthesis of SynSyn- and SynAnti-135-Triols via Intramolecular Hydrosilylation of Substituted Pent-3-en-15-diols

摘要

A stereoselective method for synthesis of syn,syn- and syn,anti-1,3,5-triols based on a double allylboration-intramolecular hydrosilylation sequence has been developed. 1,3-Syn stereocontrol is achieved in the intramolecular hydrosilylation of mono-protected (Z)-1,5-syn-diols and (E)-1,5-anti-diols with 87:13 to 95:5 and 86:14 to 88:12 diastereomeric ratios, respectively, by using 0.5 mol % of Karstedt’s catalyst in toluene.