Alcohols immobilized as p-alkoxybenzyl ethers on Wang resins have been subjected to a variety of chemical transformations based on existing functionality (enolate chemistry, carbonyl group reactivity, Mitsunobu inversion, ozonolysis, Heck reactions, etc.), in an effort to test the suitability of this novel resin-bound ether linkage. The modified substrate was released from the resin by mild acid treatment. (C) 1998 Elsevier Science Ltd. All rights reserved.
Total syntheses of aminomethyl-C-dideoxyglycopyranosides and their quinamides
作者:Dmitriy E Gremyachinskiy、Vyacheslav V Samoshin、Paul H Gross
DOI:10.1016/s0040-4039(03)01692-7
日期:2003.8
Lewis acid promoted cyclization of homoallylic alcohol 1 with acetal 2 gave 4-chloro-2-phthalimidomethyl-6-methyltetrahydropyrans. Their dehydrochlorination produced two regioisomeric dihydropyrans. Subsequent cis- and trans-dihydroxylation gave four racemic dihydroxy-6-methyl-2-phthalimidomethyI tetrahydropyrans. They were deprotected and N-acylated with a chiral quinic acid lactone, producing a library of four diastereomeric mixtures of novel C-pseudodisaccharides, which were separable after derivatization. (C) 2003 Elsevier Ltd. All rights reserved.