Synthesis of C1-alkyl- and acylglycals from glycals using a B-alkyl Suzuki–Miyaura cross coupling approach
摘要:
A B-alkyl Suzuki-Miyaura cross coupling approach provides a flexible, efficient means to convert glycals to Cl-alkyl-glycals and Cl-acylglycals that are versatile synthetic intermediates. This approach uses readily available glycal starting materials and overcomes major limitations associated with direct alkylation or acylation of glycals. Further, a commonly observed side reaction involving reduction of the halide coupling partner is suppressed by preincubation of the borane coupling partner with aqueous base, providing new mechanistic insights into the side reaction. (C) 2003 Elsevier Ltd. All rights reserved.